Well do you want your Grenades always blown away? they have to balance it somehow… it’s either cooldown so a bunch of people with repulsors don’t push you off the map along with your grenades, items and the oddball and maybe even the flag. Or no cooldown so your constantly being pushed off the map or away from players with infinite repulsor uses within a second…
Thats what the repulser is for 
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Also, that’s what movment is for…
I mean having options is never a bad idea.