system
A chat on subreddit /r/pcmasterrace
human
Part of the selling point of an MSI prebuilt is you get MSI components. Even if they decided to go that route, they'd likely have to kill off production for at least a year or two while they find a supplier and retool all the assembly lines, it's not really so simple as just switching one widget for another.
gpt
Also, using your own components would make logistics easier and reduce costs.