I read the personal finance reddit and many of those folks were all putting in the max $6,500 into their IRA in January. To me the biggest risk is lack of liquidity as you noted, especially in your 55-62 window when you might need the cash. I see it as one piece of a diversified investment portfolio -- and it's a piece that you don't really have to think about after making the contribution. I didn't make a 2022 contribution (still can until tax day) so I might do that depending on what my bonus/raise looks like.
It would sure be nice to retire at 55! I spent so much time getting my PhD that I figure I'll work until 70, but I guess we'll see.