No one said anything about it being hard to do. I've said multiple times that I have little to no issues with marth's staple tactics. If anything, my break from him has allowed me to drop habits and I've been performing better.
There is a difference between good physics for a character and the best physics for a character. His current SH isnt the best and it could be better. Plenty of characters have gotten physics reworks, but not all of them are on point. Marth is one of them.
Plenty of people here can do marth shii no problem (except SS12 lol) but a vast majority of agree, yes, he SH could be higher because it was made too low. When you over change something and dont get the intended result. You fix it. >_>
I hate how people bring up a requested change and blame it on the player's ability rather than thinking, "o hai it just might be the char lololol"