Count me among those who have only a small percentage of taxable accounts in their stash. I just added them all up, and the total is 5.6%, even though it still a few hundred Ks. I used to have a lot more in taxable, but the years of ER prior to 59-1/2 have drained them. Sometime, I thought it would be nice to have more taxable to enjoy the tax-free long-term capital gain for non-earned income up to more than $100K/year as I did back then in early ER. But then, I remember that my situation now is quite different.
I will face RMD soon and that along with SS which I can delay no longer will put me permanently into the 24% bracket. The only way out of it is if the market gets decimated, and I would not want that. So, might as well pay the tax now to do aggressive Roth conversion to get it over with. And having done that for a few years, we now have Roth accounts in the 7 figures, and that's still a fraction of the remaining IRA/401k to be converted.
And the tax-free Roth accounts allow me to take advantage of the market movements more freely without having to think about the tax ramifications. I remember in the long past, how often I was reluctant to book a stock gain even though I felt it was topping out, all because of the thought of the short-term cap gain tax liability cutting into the profit. And I held on, until there was no longer a gain but a loss.
No, my situation is now completely different. And I act accordingly. The return of my Roth has been greater than the gain in my tax-deferred accounts, which is higher than the gain in my taxable, because I have been paying more attention to the Roth while the taxable is buy-and-hold. And buy-and-hold over so many years mean no loss anywhere to do tax loss harvesting.