My group is a strange lot... They HATE both the idea of magic item shops (just buy the appropriate item for them) and the idea of tailor treasures exactly to them.
What they want? Completely random treasure, useful or not... If a parcel of a very good magic item is unuseful for them, that is all ok. They have more fun in that randomness that in min/max the character.
I am not saying that they are right or wrong. Just that this is the manner how things works for us. Some groups find more comfortable just selecting the right magic items according story and background. Others want powerful items from parcels. Yet others just want to be unsure about they get or not.
Said that, I am comfortable with the idea that monsters "drop" magic items more powerful than you are able to do or buy with money. However, if any other group has complaints with this, it is all ok. Just find a way that works for you and have fun
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