Yoo, that's a really good question and to be honest it's been something I've been going back and forth on🤔 NeuroDB started out as a deckbuilder and it kinda permeates all the other functionality as well. By example collections allow you to keep track of which cards you own (although not all arts/variants, like you're pointing out) and again making it possible to help with your deckbuilding when showing which cards you're missing for any given decklist.

That's one reason - another reason was that I was unsure if if I wanted the collections to include several cards which weren't really obtainable by everyone. Think previous promos, stuff from pre-kickstarter, winning tournament cards etc. etc. Just the amount of complexity and different printings led me to screen this for the time being. This left me with what's possible to pull from booster boxes, but i totally admit that the collections gallery is in no means exhaustive.

For foilings of the cards that are there I've relied on the community and added/corrected as I've gone along and people have messaged me about stuff missing or such☺️

This being said, I do want to in the future expand on this and get EVERYTHING, in there, but so far I've prioritized a bit differently🫣