"TL;DR written at a NASA research centre because they needed a time sharing system; "
Thanks for the correction.
The thing that struck me about reading the post was how organized Prime seemed, possibly as a result of having its core group all from the same originating company (I wouldn't call Honeywell a parent as I don't think they had any involvement in Prime).
But the game changed and they made some wrong moves and they were out evolved by Intel and MS.
Of course what has happened once can happen again.....