I don't agree with much in this post but then I usually don't agree with anyone about anything in connection with music.
I think this is not such a big deal, if someone wants to try playing the electric guitar he goes out and buys one. Then he/she ends up selling it, end of story, or he becomes someone who likes to play the guitar. A basic modular costs something similar to a basic guitar and amp. Im not going to tell someone not to buy a guitar and amp. Sure a modular synth is not for eweryone, so my suggestion is get one, if you don't like it, sell it.
By the way my modular does not replace my awesome polysynths, Omnisphere for example, Pigments, Cobalt ect. Or my computer, I think people who don't like using computers in music production or sound design are living in the stoneage seriously;)