kitty is the most feature complete terminal emulator out there. It’s the only one that properly supports ligatures and variable width characters for instance. If you want faithful terminal reproduction with built in native tmux like functionality (including non broken mouse support), kitty is about the only option.
No it isn't, I have version 0.27.1 installed and it reports itself as a VT220 rather than VT420 (like xterm), or VT520 (like Zutty). And even despite purporting to be a VT220 it still fails on LineFeed Mode, DSR, and SRM; which the developer of Zutty called out back in 2020: https://tomscii.sig7.se/2020/12/A-totally-biased-comparison-...