> That's not true at all. There are tons of ZigBee/Z-Wave devices available,

And they are being outsold 100-to-1 by noname WiFi based gear, which unlike them, works on day 1 — a thing most people want, hence the sales success.

Proprietary systems by far established a reputation for themselves as "doesn't work with anything, even itself."

WiFi is not a candy either, and for most people it means an increasingly mounting pile of one per-device apps, but that's definitely better than not having the device working at all after every homekit/google home update.