ProtonDB is a better measurement for what will run correctly whereas “playable” vs “verified” has more to do with more tangential issues such as the text is the readable on a tiny screen or it doesn’t use the mouse, etc.

In my mind ProtonDB is more reliable than playable but to your point, the number of times there’s meaningful disagreement between the two at this stage is so low given almost everything is running wrt my library to render it a moot point