I'm still much more optimistic about Kingery tbh. His problems started in the second half of 2019 but I still consider everything that's happened since then to be a write-off due to the injuries and COVID. And even if you don't agree with that, he hasn't had nearly enough ABs (at any level) to work through any problems, let alone rebuild his swing and timing. The situation this season only exacerbated that further, with no AAA games, and then being forced to call him up.
That he may be overpaid for the next two years if he's merely an adequate major league regular or useful bench player is largely immaterial; it's a sunk cost, and also the price the Phillies paid to get the deal done, in a system where most players are underpaid in Years 1-3 (which even Kingery was, at least in Year 2).
I also think he'll still have trade value in the off-season, even if it's just as a piece of a bigger package. Phillies will have to pick up money but that's also true of their two other middle IFs. It's just unfortunate they can't even pencil him in as an option should they decide to trade Segura or move Bohm off 3B.
I also don't really blame the Phillies. It's been made clear that the changes to his swing were not their doing, and he was still a good player in the multi-tool role in 2019. That he eventually slumped makes him no different from Herrera or Franco (or every other player on the Phillies in 2019 for that matter) or Bohm right now, and those guys didn't play multiple positions or get jerked around by coaching and development.
Certainly in the bigger picture, the Phillies' attempt to mimic things that other teams did well without seeming to to know how or why those teams did those things well is and was a problem, and one that still continues.