With how easy it is to open the app I personally don’t see the need for this. If I want to know my balance I simply press my finger on the reader and it’s there.
I could understand this if you had to jump through lots of hoops to log in like with traditional banks but not with Monzo.
Each to their own though and good luck with your suggestion
I have similar to the below for my Adsense earnings which is great to check up on now and then. For Monzo I’d show my balance, upcoming direct debits, left to spend perhaps?