That's true. Later products like BlitzMax or Monkey were technically more sophisticated, but less commercial. There was also an explosion in numbers of new games design languages and engines, where in the late 90ies there was a vacuum in that sense. After Qbasic there was a long nothingness, then there came DarkBasic and Blitz3D. And then dozens of others, whereby Unity became the "Metallica" of engines: all others vanished in insignificance ^^