Using a third-party node sounds to me quite centralized and at the same time quite dependent on a third party that doesn't even know about its role in this.
Nodes, plural. There would be more than one of them. Any tech-savvy person with the DEX would be able to set one up. So not at all centralized.
And that's assuming we even need them. I talk to the developers on Friday, and I am going to bring up this point: could a bunch of people running the DEX on their desktops connect to each other
without nodes, or are they going to end up being necessary.
And about the UI/UX issue: I don't understand how developers consistently and without fail spend the amount of money required to make something like Bisq, UnstoppableSwap, etc and think that everyone else is as technologically sophisticated as they are, and that the user experience somehow doesn't matter. That's the main problem that I intend to solve.