Hey Ben,
You have TPE, that's a great App that I use a lot.
As for your Raw, unless your camera syncs wirelessly to your iPhone I wouldn't worry about it. I have been using that ability on my Sony A6400 but only because I look at that as more of a snap shot, but it's still decent quality and I can use that to shoot something on the road while traveling and then upload it to FocalWorld. I can also wirelessly transfer with my Nikon D850 and have done that a time a two but mostly I want to do serious edits on photos off of that and iPhone edits in general will be more basic edits because the screen is smaller it will be harder to see some of the smaller details with deal with when editing.
So... my other Apps.
Sky Guide - is the one you saw me use for the Milky Way. There are other apps that do the same thing, but I just settled on this one.
Moon - That's it's name, it's Icon is just a Moon that is 50/50. I like it mainly because it gives a Calendar View so it's easy to plot out when the moon will be Milky Way friendly. It also gives daily info, but I mainly like it because of the fast access to the Calendar view of the Moon phases.
Wunderground - For Weather. In general it seems the most accurate.
PS Express - It's Photoshop Express by Adobe. I use it for all of my photo editing on the iPhone. There are other apps, but I like it's ease of use the best.
MotionX-GPS - I use this to mark all of my GPS waypoints. It's like Garmin but so much easier. You can download maps for when you don't have a cell signal. It has trails and roads even on it depending on what overlay you want to see. I use the trails when backpacking. But I mainly use it to mark with a GPS coord the places I go so I can get back there again.
Tide Graph - You might not need this, but since I am listing my Apps. I use that to know what the tide will be at the ocean. It's invaluable because depending on what the tide height is will determine what the beach will look like and what features will be showing.
ExposureCalc - An easy to use App that just converts Exposure settings. Like that's what I use at night when I am shooting my 25-30 sec exposures but then want to shoot a longer one, say 20 mins or 45 mins. I don't want to find out after 45 mins I messed up, so this let's you plug in ISO, fstop and shutter speed and then changing a setting and getting the longer result.
Apps I have but don't use much though everyone else uses them.
PhotoPills - I have it and it's like the Swiss Army knife because it does pretty much everything in that one App that all of my other Apps do by themselves.. I don't use it much because I have been using the other Apps for years and I like the Single Focus Apps. There is no menu looking or searching, and I am just used to my older apps. But I didn't want to leave PhotoPills off the list since I know others use it a lot.
Dark Skies - Another App getting great reviews that I just haven't messed with yet, but I know lot's of people are using it.
I think that's it, though I am sure I missed something.