Simple suggestions: Include a sort feature for decks you have created. For example: “sort by class” will reorganize your list of decks by putting the same class next to each other in the list. There could be other types of sorting features but this seems the most intuitive and useful.
I believe it is way overdue for some QoL improvements to the deck building/deck selection user interface. It has mostly stayed the same for 10 years.
Thank you.
~Player since beta