Because even if they were on the mobo, they would still be microscopic.
LOL that dude is probably picturing little house fuses you can change out and not what they actually are, teeny tiny little pieces of wire barely visible to the human eye in the CPU that actually physically burn out... think the filaments in a lightbulb only at a microscopic level, there's no way you're getting at them unless you have access to MIT lol.

