It’s totally OK to take breaks from game acquisitions!
Of course a massive backlog is a potential problem for mostly anybody who has been buying games for some time. Bundles, freebies, etc, only help amplify the size of a backlog.
Avoiding games that you are attracted to, but ultimately wouldn’t play, is certainly a useful skill to keeping expenses in check and containing backlog inflation.
At the same time, my belief is that sometimes backlogging is a cause of discontent, when it does not need to be one.
Psychologically, there is certainly something that can be described as acquisition or backlog fatigue.
OTOH, as long as a significant enough fraction of games acquired are want-to-plays and the price is low enough, and of course, as long as the total spending stays reasonable and under control, it seems counterproductive to make ourselves unhappy about owning many games.
To put this in a slightly different perspective, and taking this to an extreme for the sake of making it obvious, expecting to play everything or most of a bundle, might be unrealistic and a recipe for dissatisfaction.
We should be looking for a balance between buying and skipping that we are personally fine with. I have been guilty of not buying some deals that I persuaded myself I would not play, only to later kind of regretting the skip. As most people I am more averse to loss, so skipping when I shouldn’t have, is worse than permanent backlogging.
Finding this happy medium is then an exercise in figuring out how to keep myself as happy as possible.