The video downloads are historical reasons. Formerly it was much more expensive to download the 4k video than the HD video. The optioon also exists with Premium assets, because high res assets are much more expensive than low res assets.
I agree with you that many contributors simply upscale assets to death. But that is not the correct way to handle this issue.
But you did not understand what @daniellei4510 suggested: instead of downloading, resizing, saving a copy, deleting the original, you could simply download and resize, without saving a copy. Simply overwriting the original. And to do that operation you could even automate this, so that it would work in one rush, without much user interaction.
On a different side, storage is so cheap that the few megabytes should not m,ake an issue anymore. (I know, thge backup time will increase, and that is normally a bigger issue). But there is no need to back-up the originals.
IMHO: choosing the correct size during the download phase will offset the gains, not having to resize the assets.
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