Yes Qualcomm has a 5g chips and look how much more raw battery capacity those 5g phones need to keep up. The Samsung 5g phones (s10+ and note 10+) have 4500mAh batteries.
Per a tomsguide test, the S10+ (4100mAh) lasted 12:35 and the s10+ 5g version (4500mAh) 10:56, almost 2 hours less life despite 400 more mAh. They're roughly the same screen size and specs overall too.
You really want your iphone to last 6 hours just because "MOH 5Gzzzz!!!" The XS Max only lasts that 10 hours in the same tomsguide test; so cut 2-3 hours off that even if iphone batteries got bigger
Its very clear power is still a huge issue with 5g. It's really a beta test right now. Watch Rene Richie's video on this posted today, he explains it all in tech terms
The phone side isn't there regardless of coverage either; the 5g phones out right now are basically betas (maybe alphas) like the original HTC 4g phones (I think in early 2011) mentioned. It will take generations of chips to fix the current issues. The first iphone with 4g was 1-2 years behind that HTC in late 2012.
And 5g coverage wont be NEAR usable/widespread for years it sounds like. And from tests I've seen if you turn the wrong way or stand behind something the 5g drops to 4g. They have a huge issue they need a ton more access points for 5g.
it's going to take WAY longer to roll out than 4g slap some new nodes on the towers and done rollout like some think. I DON'T think you will see anywhere near widespread 5g in 2020; even in major cities. Some pockets of it but not consistently due to how short the signal carries and getting together all of those leases (city approval, permits, etc etc) to install more nodes simply takes time in big cities..
This is the same tired rinse and repeat Apple sucks argument every few years with new tech. I cannot see why anyone would want to struggle with half-baked tech. If you want to tinker there will always be some bleeding-edge Android device with it; but Apple caters to the masses.