Getting back to the OP's question, part of the answer to stock percentage in retirement depends on where your income in retirement comes from, specifically how much you need to pull from investments.
In my case, I pulled some money from portfolio for living expenses in early retirement years, but once I started SS four years ago at age 70, on top of my pension/annuity income, I find i have excess income almost every month which I invest into stock index funds (VOO, QQQ, VGT, MGK) in my taxable account.
Overall, including taxable, tax-deferred, and Roth accounts, I'm 90-95% stock index funds, the rest in settlement funds (MM).
Especially in my growing taxable account, I target keeping 5% in my settlement fund indefinitely with a few low-ball limit orders outstanding, to take advantage of infrequent buying opportunities.
I never got to do this in my working days, it was all dull payroll reductions into my 403(b).
So it's kinda fun to be able to do this now...