Not to pretend I know it all, but have actively been using Linux on desktops and normal laptops for years now and I do have to agree.
Those old Macs are actually quite hard to get working right (fans, touchpad etc).
It is not impossible, but it takes quite an investment.
But Macs aside, nowadays a lot of desktops ánd laptops install flawlessly though.
Typical cluckbait.