Late to the backlog discussion. Mine is vastly smaller than many people's here, yet I have already abandoned the hope of completing every game in it. It's just impossible considering my playstyle. I really hate treating games as tasks which have to be completed one-by-one. The thinking of "ok, this is done. NEXT!" never suit me, not only in gaming but also other aspects of life. I usually take on games leisurely, eg. walking around the world to examine the level design, texture and details. taking screenshots, trying to complete everything as much as possible and reflecting on what I have played after completion. Therefore, to me, time taken in actually beating a game and its aftermath are always pretty long.
Honestly, I don't have any intention to change my pace or to stop buying games. Owning games feel great. I would have purchased tons of stuff if covid did not happen. Lately I am making a purchase list on lesser-known games on retro consoles like SNES and PC Engine. Gotta say, there are so many interesting games that I want to play, and researching on and adding them into backlog is part of the fun.