There's a tough line to walk with the bench. You want to allow for the kids to be the fill-ins if there's a lengthy injury or extensive underperformance. I think that's part of why versatility has been the focus to this point.
But at the same time, I don't think we can just punt on the bench. Right now the bench is Kelly, Berti, and two of Canario/Brujan/Workman. That group combined for 12 major league homeruns last year. ZiPS does not project any of them to crack a 90 wRC+ this year. It is an offensive black hole.
Circling back to the kids, we don't have a good 1B candidate in the immediate term, certainly not a RHH one. Caissie's not played the position in real games, Ballesteros would ideally focus on catching, and Jonny Long hasn't played a game at Iowa. This team really needs an actual backup 1B, even if we'd quibble about who and how many resources to allocate to him.
So i understand wanting to hold resources back for bigger moves, and that's certainly why this hasn't already happened already. You read the article and Turner's already got wife approval, this sounds fairly far along, and probably gets finalized within a day of Bregman's decision.