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> Another, non-algorithm related complaint is that it’s difficult to watch a channel from oldest to newest, that is, keeping track of up to where you’ve already watched within the channel’s history

Invidious with an account has been has been very useful for this. In the channel's pages, it shows what videos have been watched, up to which point.

> Another, non-algorithm related complaint is that it’s difficult to watch a channel from oldest to newest, that is, keeping track of up to where you’ve already watched within the channel’s history, in order to pick up where you last stopped, in particular for channels with hundreds of videos.

Absolutely. Furthermore Youtube is surprisingly bad at syncing progress within a single video. I often switch from iPad to desktop and back, and there's a lot of overlap between where I left off and where Youtube decides to continue, which forces me to manually seek forward. At the very least Youtube should save my play position whenever I hit pause but apparently it doesn't.

You can subscribe to youTube channel pages via RSS. I do this when I don't want to miss a channels videos.