Wang had the vision. His kids did not. They got too greedy too early, and sold instead of building. There were others. Digital Equipment, for instance.
I think it is all pretty amazing. When the technology world was nearly totally proprietary, what worked was making the pie freely available to all, while controlling the cookbook... then buying out everybody that had a good recipe.
Apple had the better idea, but the wrong approach and almost lost their way. Xerox, too. I remember when those first printer idea guys showed up at their small booth at the Mosconi Center in SFO with a printer made of painted wood with knobs on it and sold their idea of word processing software by somebody else, but where you could print documents on the kitchen table. They raised enough money there to "build" the first small printer. Nobody knew their printer was a piece of nicely fashioned wood, with fan folded paper sticking out of it.
Without the idea of the small printer, WordPerfect and Wordstar would have gone nowhere.
Of course, like IBM, Micro-Soft just bought into good ideas of others. MITS Altair, Basic, Cobol-80, Visicalc, Wordstar, Cards to work in Apple, Seattle Computer Products with its CP/M...
More than any other part of their success, hiring a LOT of really good, young people, which was also the reason for the success of Apple. Then giving them freedom to roll.
Always charging a lot of money. Always.