Is synology dumping support for all non-synology drives?

Just got alerted to this by my dad, and I'm having trouble finding anything about it. It appears that the HDD compatability lists for many recent-model synology units are populated only with synology drives. No 3rd party drives whatsoever. I've verified this for the 723+, 923+, and 1522+.... none of which seem like they're properly "enterprise" models, more SOHO models. Is synology expecting people to pay enterprise drive pricing for SOHO NAS units?

I can't seem to find any specific announcements on this... and I'm shocked that I don't see a billion threads here asking about this.

So can anyone clue me in what's going on?