Why do (certain) peripherals seem to work out of the box for android but need driver installation on desktop?

Recently I was looking for android compatible pen tablets. The ones that have android compatibility works just fine, no driver needed. Only the OTG support (which I assume is for it work as a USB host) and Android 6.0+. While to use any pen tablets, I needed to install drivers on desktop. (though it is mostly automatic). Why is this the case, even though Android has [no standards](https://android.stackexchange.com/questions/63630/why-are-there-not-generic-phone-os-installers?newreg=4d4b971bb29146af89a0e1b29bedfe4d) , unlike the PC world? I know drivers are needed as interface for any kind of hardware-software interaction, but that didn't happen on android in case of pen tablet. Although, not a lot of external hardware was supported on android, anyway, until recently. (I was not sure where to ask this question as I don't know much about android/drivers/hardware connectivity, and the correct terminologies)