The whole idea of these start ups is that cash is a thing of the past. I withdrew €50 last year, IN TOTAL in my home country.
Only for traveling to countries where cash is still necessary for taxis etc, you would need more. Revolut is no longer the one stop solution for those situations but be realistic, if you understand the costs ATMs charge, you know that every bank will have to lower free withdrawal limits. Once Monzo grows, those limits will go down. So hopping from one card to the other is useless.
My rule: payments with N26 (free payments like Revolut but no need to top up, your bank account balance is the limit and its covered when they go bankrupt).
Withdrawals when traveling outside of Euro area:
First (equivalent of) €200 with Revolut. When I need more: max (equivalent of) €285 per withdrawal with N26. When I need to withdraw more at once (I can’t imagine such a situation!) my home bank MasterCard (Dutch ING Bank, they charge 1%+€2 which makes them cheaper than N26 for withdrawals above €285).