Many of us have done it, accidently levelled up a creature or even worse pocket purchased a 1000 HC (or more) incubator.
People have asked for a confirm button but that has fallen on deaf ears - and in some cases could be annoying.
I would like to suggest an alternative - have a “Wallet/Purse” for coins and HC that purchases are made from and a separate “Bank” where you can store surplus amounts of coins and HC but you cannot use it to make purchases. You are then able to make minor purchases free of any restrictions and move across larger amounts when you want to buy something major.
This would be a relatively self contained change (just the addition of the bank) and would allow players to set their own safety nets.
[ In the interests of the new wave of positivity sweeping the forum can any comments please be restricted to thoughts on the idea and not simply “Ludia will never do it they like us to make mistakes” ]