Petition to add back item sets

Give me a minute to find one but they have stated it on multiple occasions.

Ok here is a source from the Alpha Client site.

https://support.riotgames.com/hc/en-us/articles/230175788-League-Client-Update-FAQ

DOES THE UPDATED CLIENT HAVE THE SAME FEATURES AS THE LEGACY CLIENT? Yep, plus and minus a few exceptions. All new client features like Replays and Practice Tool are going to continue to be exclusive to the updated client. One legacy client feature that isn’t going to be immediately available is the item set creator tool. Early on in the client alpha we announced that we weren't planning to rebuild the legacy client's built-in item set creator tool (although the updated client still supports custom item sets). Players passionately asked us to reconsider, so we did.

We now intend to rebuild the item set creator tool, but haven't yet started development work on it, so it could take quite some time even after we replace the legacy client. But it is finally back on our to-do list. Of course, replacing the legacy client still comes first. However, your existing item sets will still continue to work and our third-party API will still allow you to download custom item sets from community developers for in-game use.

We now intend to rebuild the item set creator tool, but haven't yet started development work on it, so it could take quite some time even after we replace the legacy client.