It's the best way indeed in keeping your wealth from deteriorating and being eaten by the massive volatility after you're finished with your investment and trading.
though there are some rumor going around in regard of USDT being doubtful because they created massive supplies of their tokens, there are other alternatives like BUSD that's guaranteed by the big companies behind.
I also usually keep my capital in stablecoins to avoid the volatile crypto market. And also sometimes the profit I make from trading crypto
I temporarily store in stablecoins. Actually the presence of stablecoins is very useful, moving funds from one exchange to another is also quite
effective using stablecoins. It's true as you said there are a lot of bad rumors about USDT, therefore we must be wise and careful when storing
money in stablecoins. Moreover, what happened to UST proves that not all stablecoins are safe for storing money, we should not keep our money
in just one place. That's why I don't just keep my money in USDT, but I keep it in several stablecoins, thus minimizing risk.