An option to have your builds be saved automatically each week or month and then have a section (with graphs and a timeline) where we can se how our build has changed over time
eg. a graph showing total CV going up and ER% down.
Of course it would be best for individual nodes of the graph to be removable if it was the specific moment your character had it artifacts swapped
I was thinking of this when searching for ideas that wouldn't increase much the load on the website or the storage used by it, but I do not truly know how it would affect it.