I think you need to understand what your banker means by that.
There's a difference between financial planning and investment adviser. What type(s) of accounts to have, how much emergency fund to have, where to store the emergency fund, should you buy a property should you start a retirement fund, how to do things tax efficiently, etc. Versus, you should buy this or that security specifically.
Bankers typically work on commission to sell you products offered by the bank, so it's probably a conflict of interest to take advice from a banker without a healthy amount of skepticism. Ultimately the bank/institution with the best products probably also has sales people, so...
Financial products aren't much different than anything else. If you were going to buy a car you would probably go to more than one dealer and look at more than one model. Hell, in this day and age, if you were going to buy shoes you'd probably shop around. There's no reason to trust one vendor completely.