Interesting you mention 80s and 90s pins in particular as the keyword is 'effort'. Chris Granner and David Thiel still put that effort in, as they both go back to the AY or DAC days when less was more in encouraging creativity and richness of sound, and still follow the same principles. FM synth from a Yamaha YM-2151 has a particular kind of punch when it's composed with properly (see BK2K) and is capable of a great deal more than artificially mimicking real instruments (see Pin*Bot). I've heard the PinSound versions of both Getaway and Twilight Zone, and while the music tracks used are the same, the style just leaves me cold - I don't feel the punch anymore. Maybe part of the problem is the same as other media music; film, TV or video game scores that don't have memorable leitmotifs and sound like the same bombastic over-orchestrated mulch.