Being able to do a backdoor Roth IRA is a pretty good incentive, even if the only one.
You'll need to check what options your 401k provide and whether these are acceptable. It is true that most 401k plans provided significantly more limited options than IRAs, but not all. Some allow full brokerage access from 401k, and many allow access to low cost funds that you wouldn't have access to on your own due to the high volume of investments available from the plan participants (Vanguard Admiral shares for example).
You may also have additional benefits attached to 401k such as ability to take loans from your plan (depending on your plan, you may be blocked from making contributions until it is repaid). In addition some 401k plans may allow to defer RMDs to until you retire (if you continue working past the age of 73).
Note that Roth IRAs do not have the RMD requirement, while Roth 401k plans do.