I have no idea why devs think pioneers should have an extra sight range than the other engineers in the game, but this is dumb. Ost already has the best HMG, the best none doctrine mortar and LMG, and strong line infantry. I don't see why they should have another strong advantage layered over this already strong faction.
It's already difficult enough to counter MG spam in the early game, the sight bonus makes it even more difficult to pull off successful flanks or can give spotting for their mortars while safe inside their own MG's firing arc when trying to counter with indirect fire. They should have the same sight as the other normal engineer units.
Because OST is the most babied faction on the game. They've been given so many advantages over the years that they were never intended to have.
Right now the best stock infantry units belong to OST. The LMG42 Grens with the early Panzergrens is more effective than BAR Riflemen, Bren Tommies, or Penals/7-man cons. It even beats out the Volks/Strums/Ober combo due to timing on Obers (and the lack of dual schreks).
This is hilarious when combined with the best MG in the game, T0 only 260mp. Mortar, and sniper too.