> needing 1-2 weeks

Sometimes up to several years or never.

Are VirtualBox and VMWare host drivers included in the Linux kernel? Granted they are not "drivers" per se but anyways.

OK, let's talk about hardware: literally thousands of WiFi adapters continue not to be supported by the Linux kernel some of which were released as early as five years ago.

And then, if you have a Windows driver you know it works and it's full featured.

The Linux driver may offer very rudiment support just to make something work.

So, it's not so simple. Far from it.