It was a different time: “Condor plans to spend one year in the development of Diablo. Personnel will consist of: one designer, one chief programmer, 2 junior programmer, 2 art director/artists, 1 illustrator/sculptor, 3 pixel artists, and 1 sound FX person” So, 11 people for a year for Diablo. Meanwhile Diablo 4 took 300+ people 6+ years. So over 150x the cost, not accounting for the fact that game developers are pa…
I think it's fair enough that modern games take much more effort; we have much higher expectations as gamers/consumers than we used to.