Yes, they were always tasteless. One job of a platform SDK is to enable creating tasteful things that mesh nicely with the platform idioms, and make it hard to create tasteless things.
With AI, creating the tasteless thing became easy.
If you give people the ability to select a font, they will select Comic Sans.
Seeing this makes it hard to believe that I actually used iTerm2 for a few years back when I was still on macOS.
... in pink on yellow too, if you add a color picker.
Giving developers the ability to impose Comic Sans on the users is bad. Giving users the ability to make their own tasteless choices is good. It's my computer and I'll make it ugly if I want to. Windows 3.1 included the famous "Hot Dog Stand" theme. The loss of this freedom only encourages user-hostile practices.