This is all valid (former FS1R owner here, made nice coin for that on eBay...) but in reality these manufacturers were selling the 95% of users who just wanted "piano" or "violin" sounds and rarely did much more than slightly modifying the presets. And their instrument divisions were often dominated by "traditional" music instrument folk, too.

The other people like you and I who want to sculpt sound, or worked in studios... they figured we could deal with it.

Or hook up our Atari STs and use a more powerful editor etc. Or SoundDiver (RIP) etc.

Most of these instruments were made before the huge waves of "electronic music" popularity from the mid-90s on. What we want from them is quite different from what the majority of traditional musicians wanted. DX Pianos, some strings, some Solid/Lately Bass, and move along.