I fear you are basing your Brewers memories of him off of 2.1 innings pitched in the playoffs in his career and from a dumb decision to punch a wall.
His covid year was magic. After that, the lowest ERA numbers of his Brewers career were his seasons as a closer, the lowest WHIP #'s he had were his years as a Brewers closer, his best K/BB numbers were as a closer.
He only blew 11 save chances as a Milwaukee Brewers pitcher in his career (including playoffs) and for reference, his save % (86.1%) is nearly identical to Josh Hader's as a Brewers player (86.9%).
I know your eyes saw what they saw but the #'s paint a much more favorable picture of who Devin Williams was on the mound. It is just too bad he tipped a few pitches against the Mets and that is predominantly what he will be remembered for.