It may be a "pillar" but it also contradicts one of the other "pillars", forming relationships with your Pokemon as if they were real pets. As Ash's massive collection shows, it's difficult to give Pokemon the individual attention they deserve when you have five dozen of them.GO or not GO IMO the series need a Pokémon catcher. Capturing and collect Pokémon is a pillar aspect of the franchise and the anime overshadow this aspect for too long.
Pokemon GO is the most sinful with this, and unsurprisingly it is most popular with adults who have outgrown the appeal of "digital pets" or "digital friends", a message that is core to the anime's enduring appeal.
If you retool the anime to be about collecting Pokemon, it's far easier for a competitor like Yo-Kai Watch to capture the attention of children. There's no shortage of "collectable" hobbies; Pokemon occupies a unique niche.