This doesn't sound like the same Bogey some here describe as unable to adjust...
If you feel like Xander Bogaerts has been something like 10 different hitters since making his debut for the Sox back in 2013, you're not wrong. He's been all over the place in terms of his approach, but I tend to think (with perhaps a bit of a rose-colored view) that it's actually indicative of an ability to adjust to big-league pitching. If the Bogaerts who showed up in Boston five years ago had stuck to his guns, he'd probably be sitting at home trying to find another career right now.
Anyway, Bogaerts knows how to adjust, which is good because he'll need to in 2018. He's a good example of the kind of player who's patient but actually doesn't really have much plate discipline. He swings as often at bad pitches as he swings at good ones, and that means that getting deep in the count doesn't do him much good -- he's as likely to roll over on a pitch off the plate as he is to force the pitcher into giving him something he can drive, like (for example) Trea Turner, above, can. Bogaerts is still a really good player, because his basic skills profile is so very strong, but with a few tweaks he could be much better. Isn't it cruel how baseball asks that of you?