I see this perspective very often, and I attribute it to the fact that we, as Browns fans, are unaccustomed to watching success.
You have to look at this in a BIG PICTURE sort of way.
Right now, sure, Baker's had a lot of success throwing to multiple targets and likes to spread the ball around. You're right about that.
However, one thing an elite receiver does is get open over and over and over, and make catch after catch after catch. Baker can go through his progressions but more often than not he'll see OBJr open a lot. He might not necessarily intend to play favorites but still end up going to Beckham quite often.
An elite receiver also makes it easier to beat hard-nosed, glued-on-your-buttcheeks defenses. Those defenses that completely dominate at the line of scrimmage and force turnovers. The defenses that, even if not ultra-talented, gameplan extremely well and take away your middling receivers. THOSE are the kind of defenses we will be seeing if we're making the playoffs. THOSE are the kind of defenses we would need to beat in order to have a chance to win a Super Bowl. Most Super Bowl winning teams have elite play-makers at the WR and TE positions (people always like to point to the Patriots but they've always had guys like Gronk and Welker and Edelman making plays when plays are impossible to make, not to mention a football gameplanning genius in Belichick).
Of course, the price of Odell Beckham Jr is key. We can't throw everything to acquire him, but you're kidding yourself if you don't think would be a fantastic and much needed addition to our team. Think big picture here and don't be a prisoner of the 6-8 win moment we have going right now.