I think the idea behind Sol’s FRC gunflame is that it would be too powerful if you could do it without any meter, so there had to be some sort of restriction on using it, even if it’s a minor one. Now, force breaks would also have the same 25% tension requirement, but those were new in AC and FRC Gunflame had been around for a while.
But I don’t really see how FRC alone makes the move ‘braindead,’ because the developers almost certainly knew the application of a FRC when they give it to a move, especially a projectile. It seems more like the developers wanted to give Sol this option to blockstring or hitconfirm into a combo and tacked on the 25% tension and the execution requirement as a very slight balancing tool. FRC Gunflame might be a braindead option, but FRC itself isn’t. Plus, as far as FRCs go, Gunflame isn’t a particularly difficult one (IMO).
FRCs have some particularly finicky things about them that necessitate specific timings to make them not even more powerful than they already are. Expanding the FRC window after the current windows lets some questionable baiting opportunities arise. Expanding FRC windows to before the current windows will inevitably allow for more combos to pop up.
I mean sure, there are some situations where it would just make sense to turn a move + its FRC into a force break and remove the FRC timing altogether, but there’s also plenty of reasons to not convert them into a force break. The primary one I see is mostly laziness, since instead of having to program a new move or anything, the developers can just designate certain frames to be FRC’d.
Randomly, out of characters I’ve messed around with, there’s really only three FRCs that I had trouble landing after about five or so minutes in practice, ABA’s final rekka, Dizzy’s ice spike, and Jam’s throw (mostly because I keep messing up the combo that I’m supposed to do right after it). Would the game be better if I was able to just mash the FRC out? Maybe for ABA’s rekka, but probably not for the other two cases.
EDIT: Well, if the actual window where the FRC actually cancels the move remains the same, then maybe the game would be better. Like BB’s five frame buffer thing for link combos, except applied for FRCs. It’d be possible for Dizzy and Jam, but ABA’s rekka would be weird trying to do it like that because you’d probably just end up RCing the 2nd part of the Rekka instead of going for the FRC on the 3rd…