Yeah, if the long jump delay is there to prevent other issues then it's of course a good thing.
And the vaulting animation cancel doesn't happen much during combat, so like you said, it's not a big problem.
Now that you mentioned that golden soul indicator, I remember seeing it after collecting each soul, but at the time I just wanted to keep playing and quickly clicked it away. Then I briefly thought "Hey, did that just say 4/5? Earlier I read that the level has 6 souls." Apparently I just didn't get the hint right, and then assumed I had misread the counter.
Can't wait to check out those changing level layouts, sounds quite interesting!
It's nice to get a bit of insight into these aspects. Smooth sailing to you.