Hey @William Overington,
thanks for the great feedback. Let me reply to a few things.
First you said you prefer a live recording that is much longer. I understand your point, but I also know that many people prefer speedart videos because they are just interested in the rough path to completion rather than looking at every individual step. To have a good middle ground, this video (and all that follow) is in 60fps. This means you can change the playback speed in the Youtube player to 0.25 and still have a smooth video. Most of the video is sped up by x5 and just 2 sections are x10 (the other two tree trunk benches and the placement of the trees). This means you can watch it almost in real speed. I hope this could be useful for you even if there is no voiceover explanation of what I am doing (there is nothing very special tho).
Another wish of you was a commentary, which I received quite often already. For me, as a non-native english speaker, it's not that easy. My written English is rather good but I lack some speaking skills. I would have to write me a script, otherwise I would just talk some BS. And even with a script, my pronunciation is also lacking. I am sure that videos with me speaking will come some time in the future, I just need to get better at speaking first.
Then you suggested creating more tutorial like videos that would even span multiple parts for a single illustration. I thought about that too already and I guess it is related to the commentary problem. I could do versions with captions instead of commentary but I am not sure if that is much better than just showing the design process.
Your lasts points were about the small UI size and the dark/light theme. As you already said about the theme, it's up to each one to decide which theme they prefer. I can work best with a dark theme. Even though I just have a 13 inch retina screen (MBP, 2015), I prefer to have a smaller UI that fits more elements. Due to the resolution of the screen, the video is available as 4k (or as close as 3360 × 2100 comes to 4k), so you can always increase the playback resolution to your needs (given your monitor is large enough). Your suggested overlay with a larger version won't really work in a speedart video but is definitely something that can be done in a more tutorial like video.
All in all, thanks for your very detailed feedback. I hope the adjustable playback speed in the Youtube player gives you a more fitting watching experience and the other points you mentioned are definitely things I will consider in the future (based on my abilities).