It just depends on who you ask and what they think living paycheck to paycheck means.
https://finance.yahoo.com/news/52-americans-live-paycheck-pa...
https://www.consumeraffairs.com/news/goldman-sachs-study-fin...
https://econofact.org/factbrief/is-there-a-consensus-that-a-...
No matter if it's "Nearly half" or 60%, things are clearly far from good for most Americans.
Americans are, adjusted for inflation, literally richer than Americans have ever been at any point in history right now, at every quintile in the income distribution. If that's "far from good" I'm not even sure what that phrase means.
If the point is just that the hedonic treadmill means Americans will continue to be less and less happy as we get more and more wealthy, well, that's the problem we need to fix.