I'd make a point that the entire line of experimental computers as developed at MIT and later commercialized by DEC, with an emphasis on realtime and graphics,

I'd make a point that the entire line of experimental computers as developed at MIT and later commercialized by DEC, with an emphasis on realtime and graphics, doesn't really adhere to this pattern. E.g., we may call the PDP-1 the first commercial workstation. (Single user, realtime, graphics, used for exploratory work, emphasis on I/O capabilities with a large array of input and output devices. But the PDP-1 saw also use as a small mainframe and was a testbed for time sharing.) In a sense, minis began conceptually as downgraded workstations. (Which became viable only as memory cycles shrunk, thus allowing for smaller word sizes.)