Samsung has had Dex for years now and it hasn't changed how people use their phone (for vast majority anyway). Maybe having it built into android will increase adoption but given that Dex is still not that practical or robust, it will be a while until Google's implementation will be robust. Obviously, it's a shame the feature won't be available on fair phone but the phone isn't that fast or have lots of ram anyway so I doubt desktop mode would truelly be that useful. It's a shame but, for me, it would not impact my buying decision