A boxing purist isn't that radically different than a regular fan. He will still appreciate a wrecking machine like Gennady Golovkin, who dismantles opponents with technical precision. Like any fan, a purist wants to see Manny Pacquiao and Floyd Mayweather get made, because they are the two biggest names in the sport.
A true purist even enjoys the excitement of a slugfest and recognizes how much fights like that drive the popularity of the sport. A boxing purist, above all else, longs for the old days, when the "Sweet Science of Bruising" was accorded it's proper status as a major sport.
But there are certain fights that are particularly attractive to the more serious fan, who enjoys technical boxing as much, or more, than mere flying fists. I think all the fights on this list would be good for the sport and would be received enthusiastically by more casual fans.
But the boxing purists would rejoice to see them.