I definitely think some of the regrades I’ve seen are worthwhile, but some go overboard. I don’t think any movie made in the last 10-15 years or so needs it unless you’re doing something significantly different with it - removing a “blanket tint” from the latest Captain America just seems wildly unnecessary to me.

There are some exceptions - the Fellowship of the Ring Extended BR is in dire need of a regrade (while I like kk650’s, it’s not perfect) - but mostly, unless it’s an older movie whose colors are obviously out of whack (Star Wars) or given revisionist “modernized” grading (Aliens), regrading is generally a case of finding fault because you’re looking for it rather than because it’s there.