Hi, Yes, Phone size should not go beyond 6.0″ ., But unfortunately we are in situation that you have to pick a big size phone even from mid range to high end devices. Only few good mobiles are there in compact size but those are too costly to buy. like Galaxy S24, Pixel 8, iPhone 15.
Only these three models are there. Now a days 6.7″ becomes a norm to have minimum size even from lower midrange to Hight end devices. This should be stopped and customer should have multiple choice to choose.
I think as a manufacturer should consider one mini and one regular phone in each price bracket without creating confusion by making every alphabet as one series of mobiles which has same screen size but few internal changes to that.