I'll cheerfully point out the throwback to that trend: the SAGA System incarnation of Marvel Super Heroes, which we both know well and love. The rules system was less vague but still quite light, and the add-ons split evenly from sourcebooks and adventures. I also loved the digest-size format. A pity it "went away" in the TSR-to-Wizards, many systems-to-Only D20 transitions.
I might throw a quibble here: better guidance for miniatures use might have been nice. I notice the three old guard games you mention rely heavily on maps; Marvel-SAGA left all that in the realm of the story. This doesn't really bother me -- I seldom muck about with figures and use only the most abstractly doodled maps -- but with comic book superheroics being such a visually oriented medium, visual aids would tend to help a game. (If my recall of this is wrong, I'm sure someone will happily leap up to correct me.)
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I might throw a quibble here: better guidance for miniatures use might have been nice. I notice the three old guard games you mention rely heavily on maps; Marvel-SAGA left all that in the realm of the story. This doesn't really bother me -- I seldom muck about with figures and use only the most abstractly doodled maps -- but with comic book superheroics being such a visually oriented medium, visual aids would tend to help a game. (If my recall of this is wrong, I'm sure someone will happily leap up to correct me.)