The stock portion is reduced, yes, but there's almost always some kind of mix of stocks in the portfolio. That's not necessarily the main issue.

First, you may not get to choose the timing. A lot of older people got trapped in the 2008 downturn. They were planning on retiring a few years out, but they lost their jobs and never got them back. Not only was their portfolio unprepared just based on when they planned to retire, but also the stock crash killed a chunk of what they had. Double wammy of losing their job and destroying their portfolio.

Second, inflation hits hard. If there's a period of high inflation right when you retire, that can really hurt your savings regardless of how it's distributed. One of the things those forced 2008 retirees had going for them was that we had a period of relatively low inflation for the next decade. If you took out housing (older people often own their home outright), inflation was sometimes negative.

Capitalism, even when it generally makes line go up, does so in a spiky way. Those spikes cause problems that tend to hit the working class the hardest. Sometimes in ways that cannot be recovered.

There are some liberal economists, particularly of a Modern Monetary Theory bent, who do argue for policies that would flatten growth in return for predictability. Capitalism always goes for the sugar rush of high gains, though. For example, the Fed left rates at rock bottom for far too long, thus letting the market continue extremely high gains (over 20% per year of the sp500, when 7% is a typical long term average). Likewise, you have corps chasing high profits and assuming post pandemic pent up demand would continue indefinitely. Which is now leading to layoffs while major stockholders continue to sweep it in. Both of these lead to the recent high inflation.

I think the efforts to flatten it out are doomed. Capitalism can't solve its own problems.