Ostheer T4 buffs or the faction is dead after the inevitable heavy tank nerfs. Ostheer is on life support in the lategame as it is and this life support is the Tiger. Kind of a shame for the supposed lategame faction to not be able to compete lategame.
Ele+Brummbär+Panzerwerfer+Spotting Scopes would like to have a word with you. And the no late-game thing has more to do with the power level of Jackson, Scott, Rifle blobs on the USF side and the overall power level of Soviet late game than with Ostheer late game being bad. Try playing OKW without Tiger against a meta Soviet doctrine that includes IS2/ISU. It's next to impossible as well if the Soviet player is good enough to not get outplayed constantly. On equal skill levels the Soviet player has a big advantage and all the tournaments haven shown that time and time again. If the Axis (including OKW) player doesn't have a substantial lead he usually loses to 375 armour IS2 + SU85+ Shocks/IL2 loiter (depending on doctrine) + T70 recon+ Katy combo and now 7 Man/SVT Conscripts are another big issue because they are just WAY better than Grens and Volks.