I suppose the same reason companies get rid of perfectly serviceable laptops and servers: depreciation and chasing after fractionally larger efficiencies.
Ya re-upping gov/state incentives is the theory I’ve heard in a few places. See e-bikes/EVs/general combustion leases where the same happens. Luckily, same as housing and transportation it dumps a bunch of lightly used but performant gear into the market for people like me.
