From what you guys have tested and from some testing that i have done and yes, it was messing with me every time i got a launch and wasn't hitting ear slicer in my combos, however... the timing is more strict, not easier(IMO and from testing), this is for both !mcf along with his spin JF's/ear slicer, an example is SC4 versions of both(!mcf/ear slicer) compared to SC5 was much more lenient , now its more of a real just frame, hitting and releasing before entering any one next input. Another example would be like Yoshi's SC4 4a JF series, you had to hit/release before the next JF input was entered and repeat the process in order for each hit to JF into another for each sequence, and we all know how often we did not see those in streams/tourney matches, and we did see plenty more of !mcf and ear slicer throughout SC4 life span, why? because it was easier, plain and simple...this was def an intentional move by Namco to make it exactly the way it is, IMO...and also am cool with learning their new timing(s).
I suppose my final thoughts in a nutshell is this, more strict=more of a JF the moves has actually become( for ALL JF's so far for Yoshi atleast). if any of your feel its different in any way other than what i explained, whether it be easier, more difficult and why, post your thoughts on why so we can all get to the finish line on this.
Although, i did notice that !mcf seemed easier at a point(until i started to use both ear slicer/!mcf equally in play) this could have just be in my head due to the new JF timing changes... i know we all have been feeling mixed on this, so i'm gonna go with tighter execution from the release of the(a:) part of both !mcf and ear slicer JF's, i am also a pad player btw, i guess i could try this on stick and see if anything changes regarding the hit to release timing...mostly just release timing before hitting the next part of the JF(s).
A good way to look at is this: do not try and "rush" the JF's out, as in hitting a:b+k/2a:b as fast as possible and focus on what i mentioned about the a: release timing on BOTH !mcf and ear slicer into their respected commands, leave the JF' spins out for now since all 3 of those have their own 3 different respected speeds... and see where that can take us...i also use "claw style" on PS3 pad(no shoulder button mapping used), so i feel my testing on this is more accurate by using only face buttons or arcade stick style for better words.
All in all it feels faster, but faster in regard to the release timing on the a:(fast realease) into b+k/b part of the JF's.
neorussell, that infinite i believe was also in SC4 on stages that had corners(or it was though to be?), from memory i just remember it being banned(as it was considered an infinite) even though it was stage placement dependent/specific... due to this, it was non-spammable, i dunno...lol