I think there is a lot of stable coins out there to choose from and not just limited to USDT alone, so why we bother ourselves with it, but let's accept the fact that USDT is most used USdollar-backed stable coin in the market, so if you don't trust USDT, then you can pick other US dollar-backed stable coins like USDC, PAX, etc and even the Gold-backed stable coins if you wish. IMO, centralized or decentralized aspect is not a big deal to me as long as there is an option to choose.
yea USDT is most popular among exchanges and it has most trading pairs available. But i agree there are lots of other stable coins as well. It all depends on which school of thought you believe or follow if you listen to Chico Crypto on youtube he has done numerous video's on the shady things that are going on with USDT.