Everything should be usable in any situation, specially in this bracket. Without the use of bandage, agm and herb duels would be a 10second thing.
Everyone has first aid 225/225 anyways, the bandages are cheap and you can just farm some humanoids in EPL if you dont wanna buy them. I don't have AGM and I don't have herbing, but that is my problem and I have to deal with the fact that I was to lazy to get it. I can be very annoyed when someone else pops it, but I have to find a way to counter it, being it bandages, AGM or herbing.
Gourge-restealth-bandage-whatever is not fighting cowardly. It's fighting smart trying to figure out how you can turn the fight and play on your terms. If I can't counter what they are doing, they're smart. I wish you could use potions in skirmish arena, just to make them last longer.
Popping cooldowns (sprint, evasion etc) should be allowed at any time also.
Imagine it being a RL fight. If you had the oppertunity to instant heal every wound and fight back with renewed strength, would you do it? Or rather die because it would be cowardly to do so.