If you look back to the way computers were designed and build in the 1960s and 1970s, back then ALL companies made there one CPUs and each had it's own operating system. Every company had total control over their line of computers.
Apple did not invent this. It is just the only way it was done. Apple one of the few "vertical" computer companies who make everything. I think IBM was first.
IBM started in the late 1880's (yes in the 19th century) with mechanical computers then moved into vacuum tubes in the mid 20th century but always they controlled the entire "experience", sales, repair, training and so on.
I hope more companies get back to this idea.