I feel like, practically speaking, barely anyone will ever actually spend their pity gems pulling a GS-Original unit that's always available anyways, so in practicality, not much changes.
But on the flip side, the knowledge that literally anytime you wanted you could suddenly buy these units, no time-restraints, no summons necessary, completely tanks their feeling of rarity/the satisfaction-level of pulling/acquiring them imo. I mean, that's the whole point (or at least a key component) of a gacha game, is the satisfaction of collecting different units.
For example, I'm excited for Halloween to come back around, because I really want to try & get Halloween Forte. (To be honest, I wouldn't mind Charlotte or Valerie since I didn't end up getting either of them last year either, but Forte is who I really want). Would there be much, if any, excitement on my end for the Halloween banner coming up if I knew that anytime over the past few months I could've just bought them anyways? (Would I have? No, because I'd be wasting pity gems on units that aren't truly temporary/exclusive. But the fact remains that at any time whatsoever, I could have, and that completely changes the whole dynamic surrounding collecting GS-Original units..)
Just my opinion; thoughts?