Yeah, I don't understand. I spend my day in the macOS terminal app and the thought "Hey I'd like a better terminal" has never occurred to me.
Maybe it's better now, but when I started my time on OSX, the built in terminal defaulted to "unlimited" scrollback, so if you were used to tailing giant log files, it would beachball pretty quick. I spent the rest of my time using iterm2 instead; it defaulted to a sensible scrollback length; and at some point it added a progress bar when you made a giant paste.
Perhaps my needs are too pedestrian, but I don't believe I've ever needed anything more than what the macOS Terminal app is capable of. I've tried the vaunted iTerm2 and Ghostty among others but they never stuck.