I'll admit the fidelity "retirement score" tracker is doing most of the heavy lifting on my negativity.
Let's assume you have no other savings each year aside from 6k Roth + 20k 401k, so 26k/year
That gets you, after 30 years, to 2.2 Million dollars with an average 6% return on your investment per year.
Then you can switch to, say, a 5% dividends portfolio, and with a 2.2 million dollar fund you can live off 110'000/year just on dividends, without touching your main fund.
That's more than reasonable.
Again, assuming ZERO other savings except for your 401k+roth each year over the next 30 years. And no government pension income added. And no housing added.