For decades, I have used a great number of video terminal emulators. I have used for long time intervals at least 8 or 9 video terminal emulators, from the original xterm until the one used immediately before ghostty, which was kitty (and including Konsole, the Gnome terminal, the XFCE terminal, WezTerm and others).
I consider Ghostty the best video terminal emulator that I have used. For now, I have not encountered any noticeable bug yet, even if I spend a lot of time using it.
Nor have I encountered any feature that I really miss (though a few things that worked in other emulators, do not work, at least not with the default configuration, e.g. setting the title of a tab window with the standard escape sequence of characters; but the ghostty titles are fine, i.e. the pwd value while in shell and the invoked command otherwise).
I do not doubt that there may exist some bugs or missing features, but it seems unlikely that they can be seen during typical workflows. I have used it only in Linux, so I do not know anything about bugs under macOS.