1) UX-focused: Most of these use electron/web technologies and pray nobody notices how much slower it is.
2) Performance-focused: minimal features, but using modern rendering APIs. AFAICT, everything in this category is just taking advantage of people not knowing Kitty already exists.
What I do think is interesting about tabby, which I haven't seen mentioned too frequently by other terminals in category #1, is the ability to embed in a webpage. I'm definitely open to more products having a nice web terminal embedded in a page.