Stroke piston drones don't replace normal weapons for a good reason. You can't do SEAD or high value strikes with them.
But they're gonna be very easy to make, and they'll supplement the bomber fleet when it comes to delivering low cost bombing on infrastructure.
Even though the Ukraine war kind of proves that "lightning victories" are very difficult in today's environment, a common US cope is that China having industrial dominance doesn't matter because modern platforms can't be churned out the same way as WW2 platforms could.
Well, the stroke piston drone has a range of at least 2000km and is arguably less complicated than WW2 planes. WW2 America could build over 300 aircraft of various types in 1 day, and modern China has orders of magnitudes higher manufacturing capacity.
The way China would fight wouldn't rely on suicide drones. What they would do is hit air defenses and key targets with stealthy and/or hypersonic weapons to disrupt the invaders' abilities to maintain their rearward supply lines, while the navy, airforce and rocket force uses combined platforms to defend the 1st island chain.
Once a gap in air defense opens up from rocket force/air force SEAD missions, for example relatively early on, it would likely be in Kyushu (and SK, if SK invokes the NK-China MDT by attacking China), they can send volleys of 10 000s daily stroke piston drones, using them to take out roads, ports, electricity, water and rally points.
You don't need to wait until gaps in the air defences have opened up, before using $20K Shaheed type drones.
The cost of defensive SAMs is far greater.
For example, Patriots are 200x more expensive. Even a Stinger is at least 5x more expensive.
So suppose China were to launch large numbers of low-cost Shaheeds even whilst air defences are intact on Day One.
This will deplete the air defences (comprised of a much smaller number of expensive SAMs), and is therefore a winning strategy.