I am getting pre approved CC upgrade offer on my Apay ICICI CC since last 1.5 months. I am getting option for Paid RubyX, MMT Signature and MINE CC (variable plan, since using Mine SA).
So, the long circulating myth that Apay card holders don't get pre approved offers on CC is now busted. Also...
Yes, Amazon Pay ICICI and Paytm cobranded credit cards are the only co branded cards I know that don't work elsewhere for discounts. That makes MMT PLATINUM the next and only ICICI card to hold after Apay ICICI cc
Yes, apay is the most valuable ICICI card right now. But the offline cobranded restriction you said is only applicable on the APAY cobranded icici card, not the rest cobranded cards.
Why do you even need the platinum card since you have already applied for upgrade to MMT ? Pay the one time fee of 500, use the MMT cashback of 500 within a year and forget about platinum. Enjoy 4 free railway lounge per year and (conditional) 4 free airport lounge access on your MMT Platinum...