Good point, but:
* I'd prefer better font rendering
* I'd like to move the cursor backwards and forwards in long commands easier, maybe even with the mouse (!). Use case is, say, a long curl command and I press up-arrow to repeat it, but want to tweak something. So I press and hold left arrow and wait.
* Semi-transparent background was cool in the 2000s; these days everything is blurred like it's Vista (not a criticism, Windows does it too, it's just UI fashion.) A terminal background is a place where that might be genuinely useful.
* This may be the shell, but when I reboot and restart I get my Terminal tabs reopened to the same working directories, but the history is identical between all of them. I run different commands in different folders for different reasons, and I want to be able to press up-arrow to get back the last command(s) per tab.
I am far from a Terminal, shell, or anything related expert. There may be solutions to the above. But third party terminal apps exist so there must be a market for some problems & solutions.