So, I finally got a full MG gunpla, changed it to all 300 scaling to tower above all, and to my surprise, found out some attacks became useless:

Special attacks like the Twin Satellite Cannon can't hit SD units.

The Divider Shield's Harmonica Cannon can't hit HG/SD units (it always aim slightly above their heads)

In short, although normal long range attacks still seem to work fine, Ex Attacks seem to have a target that would aim for slightly above the HG head. If the beam is large it can still hit them (Like the Satellite Cannon), but if it's an horizontal beam like the Harmonica Cannon, and maybe the Crossbone Bowgun, they never hit, even flying to try to force them to aim down they will always hit slightly above their heads.

So I'm wondering if there is still a chance of the game receiving bug fixes to readjust how aim is being done.