Synth music style invented around 30 years ago on technology that didn't exist a generation ago: "This sounds old-fashioned, the developers need to evolve."
Orchestral music played on instruments that have existed for thousands of years, in a style that's existed for hundreds: "Finally, a modern sounding ost!" 
Synth music feels "video game-y" to me in a good way. Something about it just feels fitting as music in games
I'm genuinely surprised anytime I hear jazz, funk, and/or hip-hop influences in an OST. I love a good Orchestral music, but I think we all dig it because it's our default understanding of "cinematic" (which isn't a bad thing of course).
Also shoutout to the Blasphemous games for showing that Spanish Guitar fuckin' kicks ass.
When I was much younger, I assumed techno music, being a technological creation, would be the primary form of music, and there would be so many weird and startlingly strange new ways to synthesize more of it that it'd be a never-ending audio odyssey.
But then Nolan movies BWAAAAAAAAAAMed those dreams away, for the most part.