Also vi came out that exact same year: Bill Joy wrote it at Berkeley. So I suppose you could argue that your choice is a bit like early rapper culture: east coast vs west coast!
vi is a patch to ed. Remember most terminals were teletypes that output a line at a time, so you used "ed" to edit lines one line at a time. (And likely an inspiration for the brilliant MS-DOS edlin editor). But fancy new video teletypes were becoming a thing, and it was actually possible to display multiple lines of text on the screen at a time. Bill Joy added visual mode to ed to take advantage of this so you can visually display and edit blocks of text rather than a line at a time.
Tools like grep came about from ed as well.
ed-mode is fundamental to vi when doing commands like search and replace.
Want some fun? Set your terminal to TTY mode and try using vi. Depending on how good the emulation of vi is, it might work in line-at-a-time mode or not at all.