I do not see any use in stable coins, besides keeping the money on exchanges while searching for a market entry point. Besides, the most stable coins are regulated and are backed only by a certain percentage and not in full amount.
Totally wrong, stablecoin backed by funds reserved by the company behind that project with ratio of 1:1 and usually being reviewed by the authority. The sole purpose of this coin is to keep the value of your asset and nothing more. Regulation toward stablecoin is inevitable because it is essentially a centralized coin and if they are backing the coin using dollar then they need to obey the rules.