mind you I don't wear wallets out. But slimmer is better. Only thing I don't like about my current one is the colour. But I got it as a freebee from my brothers company about 5 years ago. I do like the idea of a slim minimalist wallet with basics inside a bigger one for those times when you need more.
I will not be swapping cards etc around. I like to grab and go knowing I have what I need. Transport card, CCs x 2, debit card - for cash withdraws, library, medical, licence plus cash notes. Coins /business cards in pocket.
I've never really understood why the bank can't put all my accounts on one card. Maybe they can these days - I haven't asked for a while. Would enable 2 x less cards.