I think the detail that is overlooked is, while I agree lots of 'genres' were formed around acquisition of cheap gear, said gear was not released on the market as cheap. Maybe the exception being a TB 303 ($395 when it came out in 1981 [source wikipedia

] ) and to a degree the EMS Synthi (not cheap when it came out but, "affordable" for a prosumer). The life cycle of the ARP 2600 is a good example. The minimoog too. When Gary Numan made his albums with the minimoog, it was still a new thing and so freaking expensive they could only rent it for the day.
In the gear ecosystem, you sort of need innovation and a flow of newer things to eventually make other stuff cheap. I was just talking to Olin about how a lot of my favorite Jungle chunes

were made on car boot (see what I did?) sale samplers and drum machines...but again, those pieces of gear were top of the line when they were released...only to trickle down a half decade later.
A current example is, around this time of year I was obsessed with getting an Infinite Jets, paid top dollar for the pre order...now I'm seeing people having a hard time selling theirs.