My point is quite simple if grenadier require another buff after years of being fine, it mean that the power level has been increased and now they are up. And IS are UP also (I would say conscripts were also UP until they received the OP SVT and & men upgrade).
Actually Ostheer is the more complete faction including most units type thus the better candidate for a benchmark and thus Relic choose it, it was not me who made that choice. You actually brought that up with Croc example.
In addition which faction is the benchmark is quite irrelevant. Its like saying I prefer to call my length units meter over feet.
Actually the easiest way, is to revert some of the changes that make other units OP compared to Grenadier instead of buffing grenadier. It much easier to identify the right spot for other units since it is between their pre buff and current state.
Buffing grenadier further is moving into uncharted waters. And grenadier are not the only UP unit so are IS and even conscripts that had to received OP abilities to leave up to new power level.
I agree on the line infantry part.
You have been arguing for OST as a benchmark a lot. In some parts it makes sense IF the whole concept of a benchmark makes sense, which I briefly remarked that this is often not the case. Also your benchmark faction must be balanced within itself. What do you do if you have good line infantry but the cost/performance for an AI vehicle of zhe benchmark faction is absolutely shitty? Give every faction usable line infantry and nerf the shit out of their AI vehicle?
In the current state of the game, it does not make much sense to have a benchmark faction. The best thing is to cluster units that perform well for their cost and potential counters, and then balance other units according to them. In one situation we can nerf the IS2 because the Tiger is decently balanced. But this does not mean that the 251 has to be nerfed until people don't really use it anymore like the M5 (just exemplary)