I don't disagree with that, but we already have Bisq, which fulfills all those criteria and is truly decentralized. Adding more exchanges doing the same thing will only serve to spread the already low DEX volume even more thinly. Bisq can be used by anyone, at any time, anywhere in the world. Adding more DEXs doesn't solve the issue of people not using them.
Bisq exchange is far from perfect, people need to have Bitcoin security deposit to use it and is it almost unusable when fees are high, not to mention they will soon move to fully centralized Liquid protocol as their base protocol.
Dex exchanges can actually work very well as we saw in case with other altcoins despite high fees, so we know it's possible for people to switch from centralized exchanges to dex.
There is nothing bad in having an competition or improving something and making it better, since this is opensource space.