Sure, you're always looking to improve......but having Joey Ortiz on your team stops you from having to sign Nishioka because your farm has no other SS. Or Kyle Farmer. Or whomever.
Corbin Burnes wouldn't be on this team. And even if he was he'd be eating 20% of the salary to be on the injured list. Instead, Ortiz (who they probably had higher hopes for) at least gave you a floor that wasn't "Sign some dude in FA for 4M and hope to god he's not terrible". We, as Twins fans, should understand the value of that.
It's also not fair to the argument to focus on Joey Ortiz and then conclude they win despite their moves. They turned a closer they weren't going to retain into one of the league's best everyday catchers. That's the kind of net win that is so tremendous you'd have to whiff multiple times to zero out the gain. Durbin being a positive player is a win for them too. Their ace is the product of trading renowned baseball star Adam Lind. So let's maybe take stock of all the moves and not just the ones that help our argument.
No one is asking for the Twins to raze the team to the ground every year....but there are times to realize pivoting and bolstering your future is worth the try. You never know when that move will align with a Brice Turang, Jackson Churio, Sal Frelick, Quinn Priester call-up festival that unlocks something special. It's worth a shot if all you can do otherwise is meander your way to .500 and watch them walk for nothing.
I'll point this out too - Milwaukee isn't just about selling off. They went out and got Contreras. They went out and got Yelich. They signed Hoskins. The Twins need to be willing to sell when it's time to sell, but also buy when it's time to buy. (And you are right of course that ultimately developing internal stars is priority one)