This.
I liked Isaac Collins, but he's really not any different than Lockridge, Perkins, Badoo, etc. He's a guy who can be fine for you and put together good ABs, but the Brewers have that in spades. Mears is doing well enough with the Royals, but he's got less control than Zerpa, and is making twice the salary.
The Brewers took a low risk flyer on a guy they thought had upside. That upside is not going to show up this year, unfortunately. But he'll have another shot. Good bullpen arms are expensive. If you think he's got the stuff, you shell out a measly $2M for a guy who might well be a late-inning option down the stretch next year.
Not every move works right away, or at all. The process is what matters, and I think that was sound here. We can reasonably disagree about the utility of Isaac Collins on this roster. My belief is that he wouldn't add anything. I'm open to the idea he'd be a slight upgrade. I just don't think this is a trade we'll know the outcome of for a few years, and even if we lose it, it won't be because we made a mistake. It'll be because sometimes trades just don't work out.
And, besides, isn't it nice to "lose" a trade every once in a while just so teams keep coming back to you for business? (half blue)