I don't know if you're trolling but, probably it's all about support contracts and liability. - If your hardware hasn't reached EOL, it's probably under a warr

I don't know if you're trolling but, probably it's all about support contracts and liability. - If your hardware hasn't reached EOL, it's probably under a warranty or support contract. So you just let your provider swap/fix it. - If you tinker with anything and there's a problem with the rest of the hardware, they'll probably won't honor the warranty or support contract, or you could have problems with your insurance. If it were a home user fixing a PSU... that's a different thing.