What @Blitzo pointed out is absolutely correctAir, naval, missile, space, EW and cyber, are all virtually equally important to each other for the missions that the PLA actually are interested in for this era.
Ground forces/land warfare is multiple notches below all of those domains (acknowledging a bit of overlap of course especially for things like EW, cyber and missile technology to a lesser extent) -- however even if one wants the PLA to put money into the most high yield capabilities and effectors in ground warfare
A 2018 Xinhua article on Chinese border operations including mountains.
Pardon my reliance on Google translation below of one of the important paragraph
"The "saw-saw" operations in which the Army plays the leading role will be replaced by elite operations supported by a large system. One is system support. Intelligence support, to accurately grasp the enemy situation, terrain, and social conditions in border areas at the first time; command support, through strategic-level decision-making, campaign-level command, and tactical-level actions, to achieve accurate and efficient combat operations and maximize the effectiveness of border operations; guarantee support, to ensure The troops maintain strong and continuous combat effectiveness under any environmental conditions. The second is smart combat. Combat operations such as node destruction, guided strikes, point-point assaults, and special operations raids have become the main styles of border operations. The third is joint victory. A coalition of unmanned and manned forces, a coalition of ground and air forces, a coalition of visible and invisible forces, and a coalition of combat support and support forces have become a new landscape for border operations."