I have quite seriously considered an iPhone in the Max range to replace a Note 9 in a year or so. But if the iPhone cannot deliver enough battery for me to use this as a sometimes hotspot AND get reasonable phone time in a day, then I'll once again go for the better battery, modem integration, and reception on whichever, even though getting continued system upgrades for the Apple is far superior, considering the lives of iPhones with other family members.
I've also watched those iPhone users with battery packs, and I'm not ready to go back down that clunky, and frankly hideous, trail myself, especially when, by magic, the Apple Store says there is too much chance your iPhone 'will break' if they even try to replace the old battery [cough, cough].