Hi goldentone,
Ah yes, the benefits and bane of complete sets! Well, of course, the obvious downer is having to play pieces that you would not normally choose for one reason or another. Perhaps some pieces within a set simply don't appeal as much, or have some daunting technical issue(s). On the other hand, there comes a certain discipline with learning complete sets: It forces one out of their comfort zone, builds technique in different ways, affords the pianist broader and deeper understanding of the composer, and many people love to hear complete sets. But yes... there is definitely some pressure felt from those who urge one to do them, and also from the compositions themselves during practicing. Overall, I think it's worth it, or at least making the attempt.

I fended it off for quite a while, but finally caved in.