Wow, I am late to the party but at least I showed up, right?
I have ditched my dSLR gear for hiking and now shoot exclusively with my iPhone 11. BUT the native camera app is... "lacking" to be polite.
I bought the Camera+2 app for shooting stills ($5, I think) and Filmic Pro for shooting video ($15 - yeah, it's expensive). Both do a fantastic job of breathing new life into the iPhone's camera. My favorite feature of both is (but there are certainly lots) the ability to set and lock the AF and focus points separately.
I bought a smartphone clamp with the GoPro base so that I can use it with my GoPro camera equipment (tripod, etc.) without buying more stuff. I added a lav mic and a $20 video rig for the iPhone as well.
My entire shooting kit now (rig, phone, external mic, tripod, backpack strap clamp) weighs about half of just my dSLR and the 28 24-7- lens.
“Between every two pine trees there is a door leading to a new way of life.” (John Muir)