the problem agains is that their specialis units for ant infy dont perform well like obers and falls they should excel or perform better than thier cost because of the sole puropose of them being a specialist
This.
Actually volks are fine. They are cheap troops and effective in number. They are spammable and can buy victory with their lives. They have a hand-held AT so they are (somewhat) effective against armor, so it is a bit against the faction design that OKW units are specialists.
So the real problem is the OKW units which is suppposed to be excellent at anti-infantry -- that is, sturms, obers, falls, JLIs, pfusiliers -- are all cost ineffective even many of those have reduced reinforce cost, especially compared to those newly-added high-vetted Commandos, LMG ISs, LMG sappers and so on.
A fun fact is that OKW abuse every unit that excels against infantry over patches and patches because OKW do not have many anti-infantry options. Back before 3.31 patch OKW abuse obers, after 3.31 patch OKW abuse pfusiliers, 251 AA HT, falls, JLIs, ostwind, pz4, and now, the recently-buffed ISGs.