I wonder though. What could people want for ost anyway??? any buff even a small one would make em super OP.
It's mostly late-game scaling stuff as well as making T4 more viable (somehow).
OST simply doesn't scale well into late-game right now. Early/mid game grens are pretty good, but once late games units/vet start showing up, their high reinforcement cost makes them incredibly hard to use.
Units like the pak-howie and the scott are essentially tailor-made counters, since their main "weakness" is against moving units, but Grens with their most common upgrade (LMG42) need to stay still to be effective. Similarly, OST relies more heavily on team weapons than any other faction, which again, need to stay still to be useful. Since there seems to be an extreme resistance to nerfing those indirect-fire units, buffing OST's survivability to them (or lowering reinforce costs) would be good changes.
As for OST T4, it simply isn't viable outside of one-sided 4v4 games. There just aren't many situations where the cheaper and earlier T3 units or waiting slightly longer for call-ins aren't better choices than T4.
Need AT? Get a STUG, Pak, Schreks, P4, Ele or Tiger instead of a Panther.
Need armored AI? Get an Ostwind, P4 or Tiger instead of a brummbar.
Need arty? Get an LeFH, mortars or mortar HT instead of a PWerfer. Or use off-map.
The trouble is, i'm not sure how T4 could be 'fixed'. Buffing the panther isn't a choice, since when it
does show up, it's quite powerful. Buffing the brummbar is possible, but the micro-tax (attack ground) makes it a very tedious unit to use, and the buffs required for it
not to be tedious would make it OP. The Pwerfer, meanwhile, is incredibly situational; and I don't think buffs would change that.
Maybe remove BP3, and have BP2 unlock both T3 and T4 buildings? Or, as it's been suggested before, put a "bolster" clone into BP3+T4, meaning that two problems are fixed at the same time.
/edit
In my "impossible dream world", I'd rather just keep OST as it is now, and nerf everything else down to their level. The initial design (years ago) had OST as "The Benchmark", but with WFA and UKF, that 'benchmark' seems to have moved to either OKW or USF. Unfortunately, the amount of work required to make OST the benchmark again is far too high for the current level of support CoH2 is getting. It would take months of full-time work by the balance team to get it working.