This should be pretty obvious. Some battles you might want to use a Talisman, others you might not.
Currently it takes 3 touches (slightly more if you have to scroll) and a short lag while the Talisman equips/unequips, to use these. It’s a pain, and disincentivises purchasing them – I never run out, because I can’t be bothered using them.
Underspire Trinkets can be toggled on/off with a touch and no lag, with a count of how many you have underneath. Sounds good to me.