I personally don't think it is an issue that tanks are running locket, especially since many of them are running it with stoneplate. It is really solidifying the idea of them being protection/enablers rather than being heavy tanks and heavy damage dealers simultaneously.
I personally don't think KV is an issue rather than the other survival items that carries are able to stack up on top of it.
I do agree ardent is rather strong but it can't as easily be toned down with out also swinging the range support meta back into the apc supports. I could see an improvement for ardent and similarly zeke's is to make the support effects tuned for any carry type instead of only AA based types.
Maybe not with the queens tribute, but I really do think something needs to be toned down or retuned with all levels of the spellthief line.
I personally don't have any visual issues with relic stacks but I can appreciate any improvement in visual clarity in general.