IMO COA aside this is less an issue with the SHs and more a consequence of Bonney's power being too absurd.
It was already strong, like she can turn whole ass VAs into literal infants, and that's without the whole alternate future power up which legit should've been an awakening if not another fruit's power.
The whole Nika future thing is something I still can't wrap my brain around, it's too much honestly.
There was the one moment of her aging the lock to the room where Kuma's memories bubble was being kept but her powers were said to not work on inorganic things as far as I remember. There was kind of a similar fruit like that in Film Z though which worked on both organic and inorganic things though? Ains had it or w/e? (PTSD flashbacks to that one Sanji Nami moment sigh.)
The Nika future thing is too contrived especially for a non awakening power. Bonney is another Sugar problem, her fruit was very overlooked/underestimated before by a lot of the fanbase but come Egghead, suddenly its one of the most OP fruits in existence and literally gave us a 2nd Nika. Because 1 asspull wasn't enough. (Sir a 2nd Nika has hit the story. Imu is foaming at the mouth with rabies at this point too.)
God help us if she does awaken the fruit though, assuming it's not anyway. I also hate Toki's fruit for this reason, how do you counter a fruit that can just yeet you into the future? Even 20 years for example!? It's said it can't go back in time but I'm certain it will at some point when it returns, at least for an awakened ability. One of the 20 scrapped plots for Film Red had Luffy going back in time, so yeah.....There was a fair bit of time travel mentioned in them IIRC.
Fuck man I love devil fruits so much in the series but they've become way too broken and absurd for the sake of power creep and spectacle.
Film Red having an unstoppable demon king that even Gear 5 Luffy, Shanks and the RHP, Katakuri I think and various others being unable to harm it was peak writing lol.
I remember when Shinobus fruit was said not to work on living things, not on people but then later on it suddenly works on Mononosuke now lmao.
But as Oda said himself, he doesn't care for pleasing the audience and thus logic, sensibilites, he's just writing for his own entertainment, what he finds fun for the final saga now.