It's nothing to do with MS or W10. It's all to do with Prolific. Prolific no longer support the 2303. Existing drivers still work. On W10 you get the new driver by default which doesn't support the 2303 but does support the newer hardware. If you uninstall and install a older driver then that driver will get replaced by the latest driver during the next Windows Update.
It's Prolific's decision not to support their old devices (and counterfeits) on W10. If you have a beef, then take it up with Prolific.
I'm sure you can spin the fact that all sorts of bottom feeders in China were ripping off Prolific (and FTDI) by counterfeiting the devices and both company's reactions to this as MS's fault. Go on, you know you want to!