This is helpful. My first card is BoB's -- originally "Elite", currently "Easy" -- since 2014. Then I got HDFC MoneyBack in 2015. After that I got a home loan in 2022 -- and got four more cards in Apr and May this year -- PNB Platinum RuPay (essentially LTF), IDFC Millenia and ICICI Platinum (really LTF), and Kotak Urbane (only 15k annual spend for fee waiver).
At present I can't realistically threaten HDFC (or BoB) with closure, as that'll reduce my credit age drastically. But will do it in a couple years if they annoy me, once my "baby" credit cards turn 2.5+.