Not all non-native-looking apps are badly implemented, but a huge number of apps that use cross-platform frameworks do so primarily as a means to cut costs because the goal is to make development as cheap as possible, and that shows in other aspects of these apps too. This creates an association between cheap/lazy apps and cross platform UI frameworks.

It’s kind of like the difference between VS Code and MS Teams. Same company, same underlying technology (Electron), but Code is good while Teams is awful because MS invests so much more in Code. Even so, Teams-type apps are what tends to come to mind when people think of Electron apps because those are so much more common.

You could not be further from the truth regarding the size of the Teams vs VS Code teams. Teams has multiple times more developers, it's not a problem of funding that makes it suck.

Sometimes the bigger the team, the messier it gets and quality suffers greatly.

In my case there is another reason - if it looks cross platform it is probably taking up more resources than a native app.