These exploits work perfectly well on those platforms. The reason you hear about people targeting them less is that they are easier to target with less sophisticated attacks and also not as valuable to attackers. In the cases they are your Android "root" exploit becomes a Linux LPE super fast.

I think the difference is desktop systems are way more transparent about what's going on in the OS compared mobile OS's which behave closer to a blackbox.

Sure, but my point above is that even with more transparency you won't catch people who are good at hiding.

Are you seriously saying there aren’t exploits on non mobile platforms?

The platforms that have famously had many significant exploits over the years, and are the cause of many major data exfiltration operations?

Are you pretending that viruses and worms don’t exist? Why does forwarding through we have things like windows defender or anti viruses then?