The old 401(k) custodian wants you to keep the money with them so that they can make money off the fees. If you want to move the money from the 401(k) they would like you to put it into an IRA with them because they will collect some fees. Maybe not as much as they would from the 401(k) but more than they would if you sent all the funds out of their company.

In general money in old 401(k) accounts has less investment options compared to most IRA funds. The costs inside a 401(k) are also generally higher. You noticed that when you decided that you didn't want to transfer the money from the old 401(k) to the new 401(k).

To skip the pressure from the old custodian, just fill out the paperwork. Sometimes the new investment company can help. They want your money. The type of transfer is done every year by millions of people. In fact start with the new company, they will tell you exactly how the funds have to be transferred, and what words have to be put on the check, and where it has to go.

Now I do have a few comments about items in your question that need to be addressed:

When I mentioned that its not doing me any good sitting there and being invested on no new contributions they get quiet.

You mention that you have $750K in that 401(k). It will grow just fine in the old account. The fact you can't contribute money to it is immaterial. If you think the average growth is 7% it doesn't matter if it is in an old 401(k), a new 401(k), or an IRA. If the money is invested the same way the lets say S&P 500 the only differne would be due to fees.

The benefit being i can actually contribute up to 6k yearly based on my age (as of 2021). So same mutual funds and actually being able to contribute money vs having a 401k sitting there and being never contributed to.

You ability to contribute money to an IRA is not related to where the $750K is invested. The math works out the same either way. Now if you are a job hopper and have had 10 separate 401(k) accounts, and you also have multiple IRA accounts, that is harder to track and more problematic when calculating required distributions, but your aren't at that level of complexity.

So yes move the funds. Do it to reduce fees, do it to open up more investment choices, do it to streamline tracking. But the money will grow the same way (ignoring fees) if the plan is to pick the same mutual funds/ETFs in all your accounts.

The old 401(k) custodian wants you to keep the money with them so that they can make money off the fees. If you want to move the money from the 401(k) they would like you to put it into an IRA with them because they will collect some fees. Maybe not as much as they would from the 401(k) but more than they would if you sent all the funds out of their company. They will try and keep you in the plan that makes them the most money, which is the 401(k).

In general money in old 401(k) accounts has less investment options compared to most IRA funds. The costs inside a 401(k) are also generally higher. You noticed that when you decided that you didn't want to transfer the money from the old 401(k) to the new 401(k).

To skip the pressure from the old custodian, just fill out the paperwork. Sometimes the new investment company can help. They want your money. The type of transfer is done every year by millions of people. In fact start with the new company, they will tell you exactly how the funds have to be transferred, and what words have to be put on the check, and where it has to go.

Now I do have a few comments about items in your question that need to be addressed:

When I mentioned that its not doing me any good sitting there and being invested on no new contributions they get quiet.

You mention that you have $750K in that 401(k). It will grow just fine in the old account. The fact you can't contribute money to it is immaterial. If you think the average growth is 7% it doesn't matter if it is in an old 401(k), a new 401(k), or an IRA. If the money is invested the same way the lets say S&P 500 the only difference would be due to fees.

Let's look at the math.

You have 750K in an account that grows by 7%. That will end the year with a value of 802.5K. If the 6K in new money is added on January first the 756K will grow to 808.92. Now imagine the 6K has to be in another account. The 6K at the start of the year grows to 6.42K. When 6.42K is added to 802.5K the result is 808.92K The same number.

This is the distributive property.

x*1.07 + y*1.07 = (x+y)*1.07

The benefit being i can actually contribute up to 6k yearly based on my age (as of 2021). So same mutual funds and actually being able to contribute money vs having a 401k sitting there and being never contributed to.

You ability to contribute money to an IRA is not related to where the $750K is invested. The math works out the same either way. Now if you are a job hopper and have had 10 separate 401(k) accounts, and you also have multiple IRA accounts, that is harder to track and more problematic when calculating required distributions, but your aren't at that level of complexity.

So yes move the funds. Do it to reduce fees, do it to open up more investment choices, do it to streamline tracking. But the money will grow the same way (ignoring fees) if the plan is to pick the same mutual funds/ETFs in all your accounts.