WTH add more core styling options for mushroom cards

Why are there no core options for mushroom cards like larger icons or removing this background circle. I think I could do that in themes but then it is globally changed, I need that only on card level. For now I do it by card-mod but that is not very easy and I think also not very performant.

Left is card mod, right is mushroom original version

Mushroom cards are a third party resource and outside the scope of WTH month.