A typewriter effect looks trivial until it has to loop through several phrases, delete cleanly, and respect prefers-reduced-motion without a layout shift on every keystroke.
Reserving a fixed min-height for the typing line prevents the rest of the hero from jumping vertically as words of different lengths type in and out.
Slightly randomizing type speed per character, rather than using a perfectly even interval, is a small touch that reads as noticeably more natural.