Just a thought, from a knuckle-dragging biology scientist. TL;DR: I believe there is scope to make the hosting of a peertube instance even more lightweight in the future.
I read some time ago of people using #webAssembly to transcode video in a user's web-browser. https://blog.scottlogic.com/2020/11/23/ffmpeg-webassembly.html
Since then, I believe #WebGPU has done/is doing some clever things to improve the browser's access to the device's GPU.
I have not seen any #peertube capability that offloads video transcoding to the user in this way.
I imagine, though, that this would align well with peertube's agenda of lowering the bar to entry into web-video hosting, so I cannot help but think that this will come in time.
My own interest is seeing a #Piefed (activitypub) instance whose web-pages could #autotranslate posts into the user's own language using the user's own processing power... One day, maybe!
Thank you again for all your hard work; it is an inspiration.
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