Everyone is different, but having a "cut off" for what you collect is very important. I have my focus, but the cutoff for full sets (in my opinion) is the PS3/360/Wii+Wii U era. I haven't decided on what to do with Nintendo Switch, but I will continue to purchase the quality titles for now.
I try to limit on what i pick up for modern stuff, but it's hard to say no when games are released on a Nintendo platform for the first time or if a game has been a japan exclusive, but finally comes over to the west.