I was shooting an interrogation scene, and while setting up, the actor was reviewing his lines on his iPad. It created such an interesting eyelight, while also reflecting the kicker behind him that I told him to keep it there for the mediums and close ups.
Yeah, definitely don't want to mess with 4x4 filters while on the run. The SLR Magic MK II Variable ND is a good one. It lets you adjust the angle of it separately from the ND so you can dial in the polarization effect. Just get this, ditch the matte box and get a rubber collapsible hood. The A7III autofocus is so good you're probably better off relying on that than pulling focus yourself. I have the Fotga follow focus though and it's very good. Get some kind of shoulder mount too. Holding the camera with just your arms, even with these small cameras, will get tiring. And a LCD loupe is a must if shooting outdoors.
When Steven Spielberg first worked with Michael Kahn, he asked him about a particular edit, "Why did you cut it that way?", and Kahn said, "Because it felt right." Spielberg thought that was the best answer he'd ever heard. To me, 99 percent of editing boils down to that. Does it feel right? Murch's rules are nice, are well thought out, and if you're writing a book about editing I guess you have to come up with something. But I almost never edit while thinking about these rules. It's all gut feeling, emotions and hard earned experience.
I also looked at films in wide release a while back and found the average age of the director to be around 44 years old.
The Film Convert plugins are nice, but are very render intensive. If you're on FCP X, the built in Super 8mm filter actually does a pretty good job for this and it's free. There are sliders you can use on the filter to dial in the amount of grain and vintage colouring you want. And it plays in realtime on any decent system.
Dynamic range and color science are more important than resolution when it comes to digital image capture, one reason the Alexa is so popular with cinematographers despite it having barely more than 2k resolution up until recently.