I agree. I think a bunch of it is simply like the 'club house' presence junk. When a reporter asks about a guy who is barely hitting his weight and not really contributing much, if anything, to the team, inevitably some reporter asks about the veteran presence, and of course whoever is on the other end of the microphone is going to rave about all the intangibles and off the field benefits that the player bring to the team, thus the birth of 'veteranosity'. In reality the player may suck, they may not do a darn thing to help the culture or the clubhouse, but what else is the interviewee going to say? I know for a FACT that in some other sports it happens like that, I am sure baseball isn't any different.
I think much of the same thing comes into play with coaches. When a guy comes here and starts hitting better, of course he's going to give credit to the staff. But take Hicks for example. Anyone could have looked at this 2018 stats and videos and tried to replicate that. Any coach would be stupid to NOT see what worked best for him in the past and see if he can recreate it. That's not to say that sometimes an organization can't see a hitch in someone's swing, or the changing some mechanics might unlock some more power or potential. It DOES happen. But it also happens to players who leave the Os and end up having more success in other places than they had here. And for every Hicks/O'Hearn type, there are a dozen others who we tried to 'fix' and failed miserably. There is no magic fairy dust and some players are simply flawed, and won't be 'fixed' no matter what we try. Mateo is one of the best examples of this I've ever seen. He can spend a month looking like an MVP candidate then become the worst player in MLB for the next 6 weeks. Surely if we had a way to permanently fix him, we'd have done it a long time ago. Heck, it's way past time to give Adley a bit more of this special sauce, as what he got originally is wearing off!
I'm not trying to downplay coaching or to talk about any of their efforts, or about our players. But baseball is a game of failure, and some are simply better at failing less frequently than others. Most guys, like Jimenez, Mountcastle, Jones back in the day, Mateo, etc are very unlikely to be 'fixed'. Their flaws can sometimes to hidden for a small time, but eventually who they are wins out.