Previous posts already moved to Ukranian war thread, continue the discussion there please.
And in what scenario do you see the PLAGF needing to hold ground in the next 2-3 decades? Is India going to be charging over the Himalayas, or the South Koreans pushing through NK and across the Yalu? Or Russia sending troops across Siberia and into Manchuria? China simply has no overland threats, so makes little sense to allocate precious resources to the PLAGF that could be better invested in the AF, Navy, or RF.
Don't you think its at least worth a tiny bit of investment? Just because you don't expect holding ground to be a possibility doesn't mean it won't happen. If your goal is to go on the offensive you also have to be prepared to hold that ground should the enemy launch a counteroffensive.