You guys are probably in dark room because I can't get these results.
My daily usage is about 1-2 hours talking through Signal, Viber, Whatsapp about hour texting, Safari hour, half an hour Instagram and Tapatalk 1-2 hours.
So when I put to charge, I get 6-6:30h usage and 16-18h standby. When I use camera, I get half an hour less usage so about 5:30-6h.
Auto brightness (mostly over 50%)
Network LTE 60% - wifi 40%
BAR is turned off.
iPhone 7 10.3.3.
Thats pretty much what you should be getting. That is "normal" battery usage under Apple's terms. Your cellular signal strength can also play a pretty big role in it.