You don't think trading peanuts for a Top Two catcher in baseball moved the needle? Extending Chourio so we can keep him beyond his first 5/6 years didn't move the needle either? Tough crowd.
Looking at position players since 2023 it's mostly homegrown guys and Yelich/Adames who have provided most of the WAR, but as far as Arnold acquisitions there is Contreras (12.0 WAR) at the top, Joey Ortiz (2.7 WAR) & Blake Perkins (2.6 WAR) in 7th/9th, then guys like Mark Canha (0.9 WAR), Rhys Hoskins (0.8 WAR), Carlos Santana (0.7 WAR), Eric Haase (0.6 WAR), and Jake Bauers (0.5 WAR) who have provided more marginal value.
Pitching side is quite a bit more Arnold heavy with Tobias Myers (3.8 rWAR), Colin Rea (3.3 rWAR), Wade Miley (3.3 rWAR), Bryan Hudson (2.6 rWAR), Bryse Wilson (2.3 rWAR), Joel Payamps (2.3 rWAR), Trevor Megill (1.9 rWAR), and Jared Koenig (1.9 rWAR) taking up eight of the nine spots between #4 and #12 and then guys like Elvis Peguero (1.4 rWAR), Aaron Civale (1.3 rWAR), Chad Patrick (1.3 rWAR), Jose Quintana (1.0 rWAR), Julio Teheran (0.8 rWAR), Joe Ross (0.7 rWAR), Enoli Paredes (0.7 rWAR), Jakob Junis (0.6 rWAR), and Nick Mears (0.6 WAR) filling up most of the next dozen spots.
Add it all up and on the position player side there are 18 players to put up at least 0.5 WAR with the Brewers since 2023, Arnold acquired eight of those players totaling 20.8 WAR of the 53.0 WAR total.
On the pitching side there are 25 players to put up at least 0.5 rWAR with the Brewers since 2023, Arnold acquired 17 of those players totaling 29.8 rWAR of the 55.0 rWAR total.
With the negative momentum hanging over the team from the deadline in 2022 to Stearns taking the last year of his contract off at the end of that season (and then again a year later with Counsell's heel turn) it's not hard to imagine a parallel reality where the Brewers have 365 games of mediocrity (or worse) under their belt as of today instead of two runaway Division Titles and 41 games of mediocrity.
Leaving Smith unprotected is the only real blemish on his record for me so far, early returns on the Priester trade aren't great but realistically we won't know for a couple two tree years who "won" the trade depending how the prospects/pick progress for BOS and to what extent MIL can develop Priester into a useful SP twixt now and then.