Probably not too many, but Beltre has a lifetime .327 OBP. Garrett Anderson too. Last year Cantu had .277/29/95 with a .327 OBP. Mark Reynolds hit 28 homers and 97 RBIs with a .320 OBP.
And over the history of baseball, there have been a number of free swingers who contributed offensively. I remember Manny Sanguillen who was the prototype free swinger who still produced offensively.
Obviously it's not an advantage to hit for a low OBP, but there have been very productive hitters in the .320 -.330 OBP range.
The main point, though, is that JF if only 21. His OBP in the Winter League this year was .419 in 161 at bats.