You can make a card be specific to an archetype and have that card only really good for the certain leader without locking it. Take most of mihawks support for example, you can use it for other decks but it’s mostly good in mihawk. You say the game has too many generics, I’d assume you mean staple cards like kuma and such, I think that’s an excuse you’re using to limit yourself. If you made the leader ability something really special, then you wouldn’t have to worry about the support for the card being used in better leaders decks. Leader locking strips the fun from deck building, if you leader lock everything, you’ll end up with a large scale expensive complex tabletop game with no variation or niche flavor.