Production of audio/video tape has long been said to be a toxic process. I worked in a plant that used a process on coating raw steel where one byproduct was a powder that they then sold to BASF to produce tape. It was a byproduct of lye. Everything about that situation was bad news. Not good for us employees, transportation and storage of toxic chemicals, and who knows what else. I can't imagine it gets better down the line. But so is the manufacturing of the CD/DVDR medium. Highly toxic stuff. If it is a concern to a person...IF...if that is something in your realm of worry, files might be the only medium with a small footprint. Not making an argument here, but all the plastics we use in this pastime are on the negative side of manufacturing and carbon footprint when you consider weight, shipping, etc.
I don't care for C-10s, but I never liked noise/experimental 7"s either. I have maybe a dozen boxes of 7"s and only maybe 1/2 box of noise 7"s. With a punk background, I'm not sure why that is. It should probably be the opposite with that in mind. I'm guessing with some of us, it comes from history and habit. As a kid, I'd plant myself in front of the stereo and deep dive into the cover, lyrics, and notes of LPs. Total immersion. We didn't have any 7"s around the house, and when I got of age to buy my own music, it was always albums. From the beginning, I've been most satisfied with 30+ minutes. Learned behavior? Probably, at least in significant part.
I get the logic behind: best editing, best material, most focus, and all that jazz about short releases like 7"s and C-10s, but beyond that rational explanation, I don't really buy into that philosophy. If that's your model, cool. Like with Masonna using the pop song as a model for short tracks. There's something suspect about that for me. I'm not sure I would limit my argument to "if you can do 10 minutes, why can't you take another X amount of months and do 40 minutes?", but that is part of it. In 2019, I'm surprised everything isn't four minutes and out. The attention span of gnats. maybe we can thank bandcamp and soundcloud for that? I don't know. Or the vinyl "revolution" in battle with the phone?