As the player with over 1,000+ cards, many times, I do save a lot of hands for specific situations/tracks, but there'll be a point where I have too many saved hands which would make it time consuming to find which hands I want to use.
For this suggestion, I would like to see a folder/group system be added to the mix. This is not going to replace the hand system, but rather improve upon it. By default, every single player will have the uncategorized folder which you can put in any random hands for whatever reason. You can create folder with a name and a color to label it as such.
In the folder, you can create/rename/delete hands, move hands to a different folder, rename, and relabel. You can even leave it blank if you want to.
You can also use this to your advantage, say for example, if you're doing a collections challenge missions and you need to make preparations, or you're farming wins in club events and pull out your best hand after the opposing team joins the sections.