My experience with blends has been pretty dynamic, by which I mean, blends I that have been harsh or not tasty in the first three bowls, over time or after being put aside, have come back as decidedly good on a later sampling. And some blends that have been a real pleasure have sometimes not worn well. I think most blends improve with some time to learn about them. I think sometimes a long vacation from a blend allows me to figure it out so when I go back to it, it makes perfect sense, far fetched as that may sound.
Taste and olfactory (smell) experiences are complex and involve a learning experience, like learning to enjoy coffee as a young person.