There are a few nimble fat guys, but Vogelbach isn't really one of em. I've viewed him mostly as a DH, which is why he had to get out of the National League. He can play some first base if you need him to, but I wouldn't count on him not hurting you there over 155 games. I don't want to pay for his post-age-30 career, but he's about to turn 25 - there are some years in there if we want em.
The disconnect between his upper and lower halves that Matt is pointing out is visible at the plate too, which is why he's such an upper body hitter (and partly why he does not display Fielder-esque power). He arm slices singles and doubles pretty easily, and he takes pitches. He hit his standard .290/.390/.450 again this year, but he will be a base clogger. He's not a hacker like Jack Cust, though - Bach has a 17% K rate for his career, against a .84 batting eye.
Vogelbach reminds me of a Seth Smith type, who doesn't really wow you at any particular thing (which is why Seth Smith didn't get a real shot in the majors until 26) but who can fill a role. Like Smith, he is mostly a platoon bat against RHP (because lefties fool him pretty badly) and he can field a position enough to play there without really making you want to bet on him at that position.
Seattle's current 1B of the future is Evan White, who happens to hit righty. Letting Vogelbach play first against tough righty pitchers in 2 years or so while White is available for a late game defensive replacement isn't the worst plan... but I don't know that Seattle likes the kind of player that Bach is. Which naturally makes me wonder why they traded an arm they could have used for him. Spending capital (like Mike Montgomery) to acquire pieces that don't fit seems to be a Dipoto special.
I'm sure Oakland could figure out how to use Vogelbach's future 105, 110 OPS+ in some fashion.