Your Braves comparison is not applicable here. You're comparing a 2 month sample size (Braves) to something going on 2 years now (Jays). No one was questioning the Jays offensive strategy at this time in 2023 because the sample was small enough to where more people were expecting things to turn around than questioning whether there was an issue. Now it does feel like a real issue. If the Braves are still hitting like this 12 months from now, I don't think they'd promote their existing coaches, but who knows.
I think you're taking the "idolized Mattingly" thing a little too seriously. My point is Atkins is old school (he only looks like a nerd), and promoting Donnie Baseball after what we saw in 2023 made absolutely no sense. This contact heavy approach is all over the organization, so it's not even Donnie in isolation, it's the entire org, that's why it's hard to pinpoint what exactly the issue is or how/why it started. I don't think it's as simple as "the players who used to be really good all just began sucking in their mid 20's". There is a reason why this team hasn't developed a good position player since Bo/Vlad other than Davis Schneider, and they literally had him sitting on the bench for Cavan Biggio in April. I don't think it's pinned down to "1 thing". I just like talking s*** about Mattingly, but it's all over the org, and if change happens, it has to happen everywhere, not just at the big league level.