Simply because they’re more iconic and it was back when One Piece villains had personality and existed beyond being luffys benchmarks.
Like enels whole tournament thing and him just viscously mowing down everyone it was amazing
Enel Post timeskip would have had Chapters of flashbacks about people who kicked his ass before Luffy
One Piece worldbuilding led to the Villains not seeming so godlike anymore, people legit believed Lucci was admiral level because they lacked info.
Compare how we react to Arlong wanting to take over East Blue to Hody wanting to invade Mariejois, nowadays we realise that Arlong would have been butchered but when you read it without hindsight, he seems threatening
Doflamingo also suffered from this due to Aokiji humiliating him, Kaido making him scared and Fuji/Sabo being in his arc.
He was just charismatic enough that it didn't harm him , Big Mom and Kaido suffered heavily from being constantly called Silver Medalists and from The Oden Flashback
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Doflamingo's parasite is more effective against Hakiless Germa than FS
It's almost like Boundman was a bad matchup for Doflamingo