Bugs. When you work all day long in a terminal, you need it to be reliable. As I mentioned above, xfce4-terminal is what I normally use but select-to-copy doesn't work 100% of the time. This is super annoying. I'd switch to rxvt but it has its own problems. Despite having had terminals for so much longer, *nix has fallen behind macOS when it comes to terminal usability and reliability.