Wouldn't it be more intuitive to have it tick on the beginning of your turn instead? Because right now it seems that it's technically active for 2 turns but it's only 1 turn of practical use?
Well, I was going to ask for this too, it would help in some cases (like EM and other buffs) but could also introduce subtle bugs. Consider:
You swing your hammer at your enemy, stunning him for one turn. You end your turn.
Your opponent's turn comes. Stun is removed at the beginning of his turn, allowing him to act like he was never stunned.
This could be fixed by making buffs tick at the beginning of a turn but debuffs tick at the end. But i'd rather (from designer's perspective at least) have things handled in a uniform way instead of making exceptions. It could also be more confusing for players.
OTOH it can be the best thing we could get right now, without some serious changes to mechanics.