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I think I would literally pay $1,000 for an app that sits in the background and records microphone, system audio, and system video, then gives me trim/cut capabilities along the lines of GoldWave. I'm always being asked to record demos for work, and I apparently do them really well because they keep coming back for more, but I spend 90% of my time avoiding it, 9% of the time obsessively nitpicking and planning every detail, and 1% of the time actually recording the demo.
I tried to edit existing video in Reaper, and it works but produces weird, inconsistent results. If I try to actually save it as MP4, I get really low colour" depth and other issues. I just want to open up a video file and cut out all the extra junk and failed sentences. It should not be this hard.