You can nowadays choose freely which currencies the currency HUD element shows (up to five, switched by right clicking the icon of the currency) However even for the capped ones, be it weekly or max, it shows only the current amount. Since things like fate gems and hunt marks and stuff hasve varied caps, not to mention the weekly limit in some, having the HUD element also show these would be handy. I keep capping the fate gems as I forget their max is so low for example. Having it shown on my UI along the current amount would be nice.