If the issue is wanting access to the M4 aftermarket stocks, I find that to not be very persuasive (even if it's a minor quibble).
This is the PLA we are talking about, they're not going to sign off on those sort of after market products anyhow for domestic use, and it's not like there is an existing domestic market for it to begin with.
And if they were willing to sign off on aftermarket products or producers, it's not like manufacturers couldn't simply design stocks for the QBZ-191s own interface, which given the PLA existing as a fairly large customer base will not be hard to do.
Ultimately the situation with NODs (and their mounts) and with stocks (and alternative stocks) and with handguards (and free floating alternatives) is all downstream from whether the PLA wants to issue them at scale or not.
QBZ-191 has a picatinny top on the receiver which is a firm mounting position, exactly because they were willing to proliferate glass to their troops more widely.
Things like NOD mounts, alternative stocks, and FF handguards, won't proliferate until they actually want to proliferate NODs, custom ergonomics, and IR lasers (respectively) in a similar fashion.