The sheer lack of narrative comprehension from grown lads in this fanbase is actually worrying 
Folks have gotten so used to trolling it's started interfering with their ability to think rationally
Even with Jinbe on the crew Oda establishes the concept of "Wings of the Pirate King"
Has said wings face off against "Calamities" in the climax of the Wano arc and Jinbe, a "Tobi Roppo"
Separates the Monster Trio from the crew in a time of crisis to give the arc a bit of tension and has Nami outright call out Jinbe for not being able to stand on game like the M3 usually do but yet Jinbe > Sanji

Folks have gotten so used to trolling it's started interfering with their ability to think rationally

Even with Jinbe on the crew Oda establishes the concept of "Wings of the Pirate King"
Has said wings face off against "Calamities" in the climax of the Wano arc and Jinbe, a "Tobi Roppo"
Separates the Monster Trio from the crew in a time of crisis to give the arc a bit of tension and has Nami outright call out Jinbe for not being able to stand on game like the M3 usually do but yet Jinbe > Sanji
