I’ve been on the Monzo train for 2+ years now and only today did I realise that you can easily input a custom amount when adding/withdrawing to a Pot (etc.) by clicking on the number.
Only after you click on the figure does the blinking type cursor appear, so for years I’d assumed you could only use the ‘+’ or ‘-’ buttons to change the amount.
I now realise this was pretty dense of me but there’s arguably nothing intuitive to suggest you can / should click on the figure.
Again, probably me being slow but from a UI perspective why not just have the blinking cursor appear as a default?