Of course BTV cannot incorporate getting g two GMs to agree. But overall they do a good job, despite the flaws. The biggest one is you can make any deal equal out by pumping in ungodly sums of money.
But maybe BTV should be a tool for some folks. So far this off-season, I’ve seen baseball bloggers and podcasters - folks hoping to be taken seriously and using their real names to make it happen - throw around proposals that “made sense for both sides” like Andy Ashby, Nick Mears and Robert Gasser for Jarren Duran, and the even worse “Jake Cronenworth and Wandy Peralta for Brayan Bello”. And the thing is, that guy used your exact logic - “Boston needs a 2b and a lefty reliever”. Sure, they do. But they don’t need two underwater contracts for mediocre players at the expense of a starting pitcher with a lock on a rotation spot. But, as that Padre dork said “need and fit” for Boston. And both deals, massively unfair to Boston on BTV and in real life…