I agree with all of the points from OP, and I have to add one more to the list.
The HUD keeps disappearing on official hardcore mode, which is especially annoying in vehicles where you then have to reload or switch weapons to check if your on the primary or secondary weapon or how long until your countermeasures are back or which countermeasures you have.
Another thing that’s bugging me but is not limited to hardcore is that the squad leader role is being passed around from match to match. But that’s for another post.
Hope the fixes for the hardcore issues are coming very soon!