Exactly as you say, the greatest difference with the recent generation of video terminal emulators that use the GPU through OpenGL or the like, is the much greater rendering speed, which becomes very noticeable with millions of lines of scrolling text, especially if you use high-resolution monitors.

Unfortunately, millions of lines of scrolling text are no longer unusual, especially when you frequently compile big software projects. The use of high-resolution monitors has also been normal for many years.

Instant window rendering is addictive, so now I would never return from a fast terminal emulator like ghostty to an older video terminal emulator. The last terminal emulator that I had been using before ghostty was kitty, which was also pretty fast in comparison with traditional terminal emulators, but I like ghostty more.

Honestly not sure. I used ghosty and others for awhile but had continuous issues of it not passing a compatible term variable so a lot of tuis would break.