For Rydia, Bio actually was a substantial spell for a large chunk of the game and probably why they gave it to SMN in the first place all those years ago. In FF4 on snes, it was between the -ra and -ga spells in damage but cast instantly. So once you picked it up, it was her hardest hitting spell for about 20 levels and had no wait on the cast. It also tended to beat all her summons until you got Leviathan due to cast times and MP costs.

So while I can usually understand most ex-wow players or XIV only players comparing SMN to other MMOs there was always a baseline of Rydia in its design. Even knowing the extremely basic healing, since she did too until she grows up.