Keep in mind, Final Fantasy 8 does have a TON of design flaws that basically gear most players to just "spam attack to win". Your GF summons are overly long and take forever, so there's really not point to casting them. Especially since in the time you've summoned them and they've dealt damage, you could've dealt twice that amount of damage just mashing "Attack". On top of which, most players really won't cast magic either (unless they absolutely have to) because it's much better to just draw and junction your best spells to your stats. All of the mechanics in the game basically subconsciously tell a player to just "mash attack to win", because to do anything else wastes a massive amount of time or a really super valuable resource you could be using in much better ways. What's even worse than only linking your magic spells to your stats? Drawing magic. Takes for freakin' ever. Did you cast 8 Fire spells that last fight? Guess what, 5 minutes of battle minimum to get those 8 Fires back! Going from 0 to 100 of a spell? You're looking at 20 minutes of Drawing Magic for at least two people (and enemies can run out of magic, so if they run out, you'll have to go into ANOTHER battle to do it again). Yes, there are ways around Drawing Magic, but a good portion of them are also just as tedious.
Basically, FF8 wants you to mash "Attack" and nothing else. Animation length teaches you to mash it, and how valuable the magic spells are during the junction process teaches you to mash it.
"Done Before" doesn't mean it's a great idea to begin with. Sometimes, it just means someone was stupid enough to try it the first time.