Me for one. There is no magic in modern fighters except perhaps in conditioning. The basics of boxing have been around for a long time.
Nostalgia noun
a sentimental longing or wistful affection for the past, typically for a period or place with happy personal associations.
You're associating good feelings from the past with the fighters. Has absolutely nothing to do with how good they were as much as how they made you feel.
Old fighters were garbage by today's standards. All of them.
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