@Ceiling discussion.
The EU rule allow infinite hits as long as it's not straight up and down the ceiling (90 degree angle), with the exception of the ground (2 hits on the ground max). Although they seem to have changed a bit? Not sure when or how.
Yes, it's improbable to recover from but it also burns a lot of your opponent's ki allowing you to retaliate straight after unless it's a kill, and if you're caught out you risk dying. That's how most competitive games work if you're caught up in a bad situation you are punished by death instantly, most E-sports games work exactly like that now, e.g CS:GO & especially MOBA games such as League of Legends. You must be punished for your mistakes. It's not like you can recover from getting hit a second time in the air most of the time either, but I don't see people becoming whiny because of that, but suddenly when you take it further by expanding on your wallhits (game mechanic, intended or not) it's an issue?
It's not like you cannot do it to your enemy yourself, if you lack the skill or get caught more than the enemy that is your own fault. Another factor people forget is positioning and environmental awareness. If you're at the middle of the map you're usually fine, if you're above half you try to stay below your enemy so you can get ceiling hits off, if you're below half of the map you stay above to try to get ground hits off. If you're near a wall, you try to be the one that's furthest away from the wall it's all how you control your self and the positioning you have near your enemy and in your environment. It takes a lot of skill constantly being at an advantage over your enemy.
I was always surprised at the almost unanimous opinion here from the forum users when it comes to ceiling hits. From my experience people in-game (people who actually play the game) are a lot more casual and accepting of it. Before you say it's just Europe it wasn't frowned upon in the US, it just wasn't allowed in duels but most of the time that rule was skipped and people did roof hits in the US too.