Yep, anecdotal evidence but all my friends who like Pokemon were happy with the choice because they think there are way too many Pokemon as it is.
Pretty much this. We may have lost roughly half the national dex, but the remaining half of the national dex is still a freakishly huge amount of mons. People need to stop pretending that having 'only' 400+ Pokémon (which is still 100+ more than the Sun and Moon dex had to offer!) means that the games are lacking in content.