I won't argue with you thinking the game feels restrained. It's a common complaint. But while this criticism has credence I think there is a larger issue with fighting games in recent years
Fighting game players have gotten too smart and don't realize it. Since twitter, YouTube, and the initial hype of SF5 the general skill level of fighting game players has risen and it's affected the way we play them. We learn 2 years worth of a game in a week now and that rapid development snowballs like it never has before
We're in an era where anybody off the street could know all the frames, optimal punishes, oki, etc for their characters. This has made everything look a lot more rigid than previous generations.
This is where SF5 angers a lot of people in a way they haven't been able to articulate. SF5 is a lot like chess. If you know less than your opponent you lose. It's extremely heavy on knowledge. This is a turn off to a player that might've gotten by on instinct in previous generations. The most enjoyable fighting games are more like poker, where skill level definitely matters, but there's an element of chance that makes the game unpredictable. This level of chance is nearly absent in SF5, and THATS where it lost so many people in terms of gameplay. It's arguably the hardest SF game there is
There's a deeper discussion about the evolution of turns and spacing in current fighting games that also lends to your point, but the brunt of this frustration has been laid at the feet of SF5 when it's a genre wide issue. Guilty Gear Strive has the same problem (WORSE in my opinion)
I tried not to write a fukkin article but
I actually completely agree with you and have said the same thing to long time friends that are sour on fighters now.
I've told them over and over it's not just that fighters are easier yes, but also the crowd is larger and the information is abundant.
When I was going to arcade tournaments and traveling for the 2 or 3 majors they had a year it was super clear who was great good ok and bad.
Mostly because like you said it was all a knowledge check, and if not a knowledge check it was a execution check. So old heads felt a lot better with the actual limited knowledge they aquired over say 2-3 years and that knowledge crushed all bad and ok players you could even still some rounds from good players.
But now...
Week one a bad player with good execution can YouTube optimal combos only be good at that and give "better" players over the blues.
A lot of my homes hate on newer games when really it's just them and the times.
A platinum/diamond ranked player in SF5 is equivalent to 40 percent of what we played in the arcades and in our local scene. The rest being like silver and a couple grandmasters.