How can you limit the height of players on a game that is 95% dependent upon custom content? You could make online play only have licensed teams but I doubt people would like that. Or you could make online game only use on-disk players with original appearances and skills but given that those things in Ashes were wildly inconsistent, if the same was to be the case in C17, I don't know if people would be happy with that either. And is Mohammad Irfan not allowed to play?
The same goes for limiting the number of changes to bowlers. I suppose there could be a 'track changes' that records alterations from an on-disk player to an edited player. But how many changes should be allowed? Is increasing by 1 skill point considered one change? Would a change register for every editing session even if you just increased one skill by one point?
While I don't use the aerial marker I've never had a problem playing front foot shots - pulls at least on short balls. Maybe you need to adjust the player height in order to be able to play them. If a player is too small/too tall the range of playing the shot is going to be limited because of the mo-cap. Maybe this will be changed in C17.
Mattw has said that fielding has been worked on, with added motion capture work. So in terms of dropped catches and fielding in general, hopefully these will be a things of the past.
A lot of the problems seems to be not with the game but with the people you play against. That's a part of online gaming in general. Players don't play the way you play, or the way you want them to play or expect them to play. Some people want realism, some people want to win at all costs, some people want to have fun. People are dicks.
It seems like the best way to go for a game like this is to find people who feel the same way as you and create your own community of players based on certain rules and principles. If it's a success people will want to join and want to adhere to those rules. If they don't, you can kick them out.