1985?...... Ive been performing on keyboards since 1964 on stage.....and let me tell you for almost 20 years an arranger KB wasn't even heard of funny how we try to emulate the older sounds for many reasons,......yes the sound and technology has changed but the gap is slowly getting much closer..still nothing beats the real thing.
Well, I know that I'm one of the relatively younger forum users here, roughly the same age as Bachus and some others, but as you say before 1985 arrangers didn't exist anyway, so 30 years is certainly a very long time span and enough to have experienced dramatic changes in technology from FM sound generation to samples etc. I think at least for the affordable range of instruments the fastest development took place between 1986 and 1999. Since then there has been a certain slowdown.