Also, my condolences. Have you hit a funk of some kind? Where are you getting tripped up with Cammy? I know nothing about Street Fighter, but it'd be interesting anyway.
So the reason I can't plsy Cammy no more is because of my New Fightpad.... Circular Motions take much longer to execute so that means no more Quick Dive Kicks.
In terms of overall execution DOA5LR is easier than SFV, though the average execution in SFV isn't that much higher than the mid-to-high level characters in DOA. Standard "execution" is always higher in 2D fighters because those games are more tunnel-visioned than 3D fighters. For instance, you need to account for a lot more things during a match in DOA than SF.
Ryu on the Other Hand requires actual cancelling and one of his special moves is so complex that you have to change how you input his Normals to prevent him from doing the wrong move... his parry is also Shit compared to Hitomi's.
Hitomi is considered "mid" execution? I was thinking more along the lines of Honoka, Ayane or Phase-4 for example.
What special move does Ryu have that is "so complex" in SFV?
(Also don't forget my primary point that 2D fighters have higher execution requires in general to offset their tunnel-visioned focus/gameplay compared to 3D fighters on average. I.e. 3D fighters are still arguably harder to learn).
And yes 3D Fighters are more difficult to learn but its not because of Execution. Which means there's hope. Think of it like Chess vs Contortionism. Both are difficult but since chess is all knowledge then all it takes is time. Contortionism requires dexterity that you may simply not be able to attain.