This discussion… again.
Her abiity is only one that literally gets countered by experience. Never get to objective without mine check, learn 4-5 corners on map where Proxies plant their mines and you will barelly die to any. Learning long jump and Bomb squad load out also help.
Proxy needs to run to you with melee, throw a mine, switch weapon and shoot it. You can kill her while she runs, while she trows mine, while she switches weapon or just step 2 meters away and shoot her after mine exploded. With same success she may kill you with shotgun even faster instead wasting mine. Meanwhile Fragger, Fletcher and Nader will send you a present(s) from comparatively big range and you won’t do anyting with it.
If you pass the corner without mine check and die - it’s your fault.
If you rush to objective like dumb - it’s your fault.
If you run to lonely health/ammo station without mine check and die - it’s also your damn fault.
If you follow Proxy and don’t expect mine - guess what?
If you let Proxy run 10+ meters with melee, throw mine and detonate it - it’s your fucking fault you don’t learn.