It is rare to "brick" your PC by installing linux/windows. Phones are different because their input/output interfaces are limited to a single usb port, and in many cases that usb port doesn't even support host mode. Technically the phone isn't really bricked, but there's no way for a normal user to fix it without cracking open the phone to attach a jtag.
If PCs in the 1980's could be destroyed simply by improperly installing an OS, you bet manufacturers would void warranty for software misuse.
Sounds like bad design though. It's normal for embedded devices to have a non upgradable bootloader that can always be triggered at boot and is able to reflash a pristine copy of the original firmware wiping whatever was later written. iOS does that (see DFU mode), and all embedded devices I design at work do the same. Why an Android device shouldn't? Apple devices are nominally warranty voided when you jailbreak them, but since you can always reflash an original firmware leaving no traces behind, it's basically moot.
NOTE: no sarcasm here, I'm genuinely interested on why android phones can be software bricked and can't have a boot loader like anything else.
Android devices have similar failsafes (e.g. recovery, fastboot mode), but since they're part of the infrastructure that validates that you're only flashing authorized changes, you are often working around them when you modify your device.
If PCs in the 1980's could be destroyed simply by improperly installing an OS, you bet manufacturers would void warranty for software misuse.