What the purpose in having all these stablecoins?

I am really trying to understand need in having all these stablecoins. You have for example RLUSD, Tether, and USDC all backed by the dollar. Then of course you will have bank issued stablecoins from BoA once it comes out.

Does this seem kind of redundant, or is like shopping for cars/trucks? You have all these makes Ford, Nissan, Chevrolet, and etc. and it will be up to us (the consumer) to decide which one is better or which one to "invest" in.

Am I overthinking this, or is there is some simple logic that escapes me at the moment…