I think Grens are likely fine but four model squads is very unforgiving as they squads can get wiped due to clumping from mines and AOE weapons. Hence why a lot of players are going Ostruppen as a frontline screen into PGrens and Scout Car who deal the damage as it is more forgiving and easier to play.
Mines have limit of models they can affect, ironically the only mine that does not have that is ost s-mines.
AoE weapons will fuck up all squads, ost is not exception here. Build ost mortar and see how long allied weapon teams will last.
People try to play ost as it was aggressive, pace dictating faction - its not, never was, never will be, ost was and will always be a reactive faction with most tools to respond to anything, but again and again and again, grens were not and will not be a self sufficient infantry, because they are cheapest mainline with best support behind them.
Also Grens require the T0 building that costs a enough to matter in early game.
Ost starts with bonus manpower. Cost of T1 is completely irrelevant.
Most players aren't regularly using Sniper/Mortar.
Maybe that's the problem?
People stubbornly play ost like it was OKW or soviets, expecting cheapest mainline to stand up to much more expensive squads and then do surprised pikachu face when it does not work.
If I do go Grens - I use combined arms of MG42, Grens, Sniper and then T1 stuff like Scout Car/Pgren/Pak 40. It is not an easy style to play in my opinion as one mistake can hamstring you badly.
That's intended playstyle of the faction, ost was NEVER supposed to have self sufficient mainline inf.
The doctrine kind of allows that, but it will never be a stock option.
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