From your post, I conclude that it is not appropriate for players to choose HP or another additional attribute because it is weak and ineffective. As a result, I say that we are willing to consider it so that these attributes have higher numerical values and are prioritized for cards, but that still doesn't satisfy you?
Main stats:
Leather: dex/str/patk
Chain: str/pat
Mdps: int/matk
Healers: wis
These are the main stats to use in a deck. Using stamina or HP is something aditional and not needed. Many people won't do it. The main ones are what I typed.
Example number 1. How to get a Second deck: healer.
Main deck Leather: DEX / PATK / STR --- WIS (you can get main stat using your first main stat of your main deck, don't even need STR, stat number 3)
Main deck Mdps: INT / MATK / STA / HP --- WIS (you need 4 stats to achieve this one, not 2)
Main deck Chain: STR / PATK / STA / HP --- WIS (you need 4 stats to achieve this one, not 2)
Example number 2. How to get a Second deck: mdps
Main deck Leather: DEX / PATK / STR --- INT / MATK (you can get 2 main stats using your first 2 main stats of your main deck, don't even need STR, stat number 3)
Main deck Healer: WIS / STA / HP / PDEF --- INT / MATK (you need 4 stats to achieve the mdps 2 main stats, not 2)
Main deck Chain: STR / PATK / STA / HP --- INT / MATK (you need 4 stats to achieve the mdps 2 main stats, not 2)
I hope I explained myself so you see my point.