Just because the PLA does something doesn't necessarily make it the best option. For example, the PLA went into the Sino-Vietnamese war woefully underprepared in terms of infantry combat equipment. The same deal has happened multiple times to the US army. If constant combat experience isn't possible, then the priority is to plan ahead, for example, by taking lessons from the current fight in the Ukraine war. In all possible cases of future conflict, aside from a pure naval/air battle between the US and China, there will, to some degree, be ground combat, whether that be in the plateaus of Tibet, or urban combat in Taiwan. They may be low scale, (not as grand as a fight in eastern Europe), however in fact has a high probability of occurring. Upgrading infantry kits can be done in short order, but there is no guarantee that such a kit will be well designed, as seen by the current infantry combat equipment program being lacklustre and having numerous design flaws. This takes time to perfect. In addition, training, experience, and infantry combat tactics take much longer to learn from scratch. This is not something that having a massive manufacturing base can fix. Choosing to ignore a vital branch of the PLAGF until an "actual ground war" occurs is quite short-sighted.