Pzgren aren't roflstomped at all late game vs infantry. Gren cost 240mp, how can you imagine that a 240/60 unit should be able to go toes to toes with 280/60-120 unit?
I would happily upgrade my grenadier squad twice, but I can't. This doesn't mean that a riflemen and infantry sections should be better just because they have more upgrades and that the basic design of a faction should be negated by powerful vet, upgrades and indirect fire. What is the use of this faction's design then?
The problem is that the Ostheer mainline infantry unit isn't capable of reliably fighting riflemen, infantry sections or penal battalions. These units gain immense power with vetereancy, which further hampers the Ostheer mainline infantry unit. Grenadiers need to be in cover to fight effectively, yet we have double bar riflemen and double bren infantry sections destroying grenadiers in cover. USF mortar and British mortar pit both deny cover to the grenadiers in a very effective way, meaning you can't utilize the grenadiers as they were meant to be utilized.
Now people argue that you should support your grenadiers with combined arms, including mg42s and mortars. The only problem is that riflemen are supported by the USF turbo laser guided mortar that just destroys weapon teams in mostly 1 or 2 blows, including grenadiers that need cover to fight effectively. The British mortar pit does the same. On top of this, riflemen can utilize smoke and grenades on top of this turbo laser guided mortar. All these facts in essence mean that your weapon teams aren't safe anywhere and can't support your grenadiers reliably.
The only 'mainline' infantry unit the grenadiers can reliably counter are conscripts. Conscripts themselves are a joke. This shows the horrible state of conscripts and the somewhat lackluster state of grenadiers. Something needs to be done.
Edit: not even to mention when an Allied light vehicle comes out and insta gibs half of your grenadier squad on the first shot.