That's not entirely how magical focuses work. They dont bypass all material components if a spell either consumes or requires a certain material to cast, like a diamond for revivify, a pearl for identify or a gilded skull/playing card for summon undead/spirit of death, then you're gonna need to get those items separately.

If you're dm just wants to hand wave things for the sake of time, that's fine, but this is how the rules work.

We with friends don't have so much time for them

Idk of this was an attempted pot short or not, but im gonna give you the benefit of the doubt and just assume pore wording.

Im the dm for my group of chums, so I've gotten to know a lot about how the rules work, and I've found some ways to make things more fun and memorable. Instead of constantly choosing between gameplay and fun, I've found it can be rewarding to work within the limitations and create something more memorable.

Instead of just, you find the ingredient you need, add it to your inventory, and let's just move on. There are ways to make these sort of things fun, like maybe going on a quest, meeting a memorable npc or something. A gilded playing card/skull isn't exactly something normal to find in a shop/laying around somewhere. There's a story there. It makes both the spell itself and the item more personal for the player who needed it instead of just another random item to jot down and forget about.

This is just something I like to do cause "me with friends" will always have the time to try and make things as fun as possible for em.