yes, I will add a FR for that, however, Kinghat is not very active in adding features, so I wont keep my hopes up.
There already is a FR for allowing dynamic tabs since a long time, and he acknowledged, but postponed…
btw, my active icon is back using the correct spacing, I must have fluked above
card_mod 3.5.0 styling, so dont copy on 3.4.4!!
# tabbed-card style
style:
.: |
mwc-tab:hover {
--mdc-theme-primary: var(--power-color);
--mdc-tab-color-default: var(--power-color);
}
mwc-tab-bar {
background: {{'var(--lovelace-background)'
if is_state('binary_sensor.donker_thema','on')
else 'var(--primary-color)'}};
}
mwc-tab:nth-child(4) ha-icon {
--card-mod-icon:
{{'mdi:coffee' if is_state('switch.espresso_keuken','on') else
'mdi:coffee-off'}};
}
mwc-tab:
$:
mwc-tab-indicator $: |
.mdc-tab-indicator__content--underline {
border-color: var(--active-color) !important; /*override generic theme primary*/
}
.: |
.mdc-tab {
min-width: 80px;
}
.material-icons {
display: contents !important;
}
.mdc-tab--active {
--mdc-icon-size: {{states('input_number.active_icon_size')}}px;
/*background: var(--text-color-off) !important;*/
}
What I will do is create a dedicated !include styling per tabbed card, and only for the ones I like to use the dynamic icons in (most are fixed, well, for now 
)
It’s easy enough to add those dynamic icons now so it wont be much of an issue and only a bit more yaml. For the fun of it.
second tab on:
and off
even colorize them:
mwc-tab:nth-child(2) ha-icon {
--card-mod-icon:
{{'mdi:coffee' if is_state('switch.espresso_keuken','on') else
'mdi:coffee-off'}};
--card-mod-icon-color:
{{'var(--alert-color)' if is_state('switch.espresso_keuken','on') else
'var(--success-color)'}};
}
nice!
tighter template:
mwc-tab:nth-child(2) ha-icon {
{% set coffee = is_state('switch.espresso_keuken','on') %}
--card-mod-icon:
mdi:coffee{{'' if coffee else '-off'}};
--card-mod-icon-color:
var(-- {{'alert' if coffee else 'success'}}-color);
}