A simple workflow every CC user follows /must follow -
Online/Offline Purchase/Payment > Figuring out which CC to use and how (e.g buy GCs with CC instead) for maximum benefits > Make Purchase/Payment
I personally find the second step increasingly difficult / stressful on my brain as the number of CCs starts to exceed the fingers on my one hand, let alone two!
Also, that is just the CC use workflow. There is another workflow of tracking the statements and paying them before due date. There is a third workflow of dealing with the truckload of marketing / promotions via phone calls, SMS, email and even WhatsApp now. As long as everything is going well in your life (stable job with reasonable hours, no family / health issues / emergencies) all is well. Once any of that changes, so many CCs can come back to bite you.
Set up auto-debit for the full amount on all your CCs where you have a savings account with the same bank. With these many cards, you are bound to miss one payment or under-pay by a few paise once and that will attract penalties / interest or worse a solid dip on your credit score. ICICI especially is notorious of not informing CC holders of dues in paise yet reporting them as defaulters for a few paise! Also, one of the biggest misconceptions is that auto-debit causes double payment since it does not detect payments via CRED or other apps. In my experience with HDFC, SBI, ICICI, Kotak, Citi/Axis and even a coop bank like Saraswat, auto-debit never kicks in if you have paid in full at least a couple of days before due date.