Different AD during tumble seems mad un-intuitive, as already metnioned... And why would you add tasty things like wavelanding just as a purely defensive option, but not many of the other cool applications? Seems like a bit of a slippery slope. One I'm not personally against sliding down, mind you, but slippery all the same.
The issue we have is we, as of yet, have no other option.
ADT did not work, people just mashed out of strings.
NADT did not work, people were angry about arbitrary tech skill and you could STILL just mash and wiggle out of strings.
More startup or endlag on air dodges don't work, it just makes air dodges worse, and either A, eliminates them from gameplay all together, or B, artificially elongates strings until you can once again, mash out just at a slower speed and possibly even cancel it with a fast fall.
Making just the tumble AD worse is also pointless, because then people will just TAP and AD and we are back to NADT.
The pros of MADT are
1, people cannot mash or wiggle in any way shape or form. Mashing will cause them to air dodge and eat both the end lag and freefall.
2. It gives us yet another interesting defensive option.
3. It increases tether recovery game
4. It strikes a balance between NADT and ADT camps.
The cons are
1. Wavelanding may be too powerful
2. It is unintuitive
Since the pros outweigh the cons, it is at least worth a Beta test. We can then decide from experience and observation, rather than speculation, if it is a good or bad change.
Also, a manual will easily explain the mechanic ^_^ and I am up on that.