Может я старомодный, но у всех действий должна быть своя логика.

Adobe is known to be quite stringent on quality issues. And Adobe is not others. Me too, I have pictures refused by other providers that sell well here and vice versa. None of my bestsellers here sells well at other stock providers.

There is a need for high-quality pictures. Sure, you could let the buyers decide, but they cannot access the full quality asset before buying. That would get a problem. Adobe needs anyhow to vet the assets for legal aspects, they should do so also for quality aspects. Buyers are paying a lot to be able to use Adobe stock, so they have the right to get the best quality you can provide.