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Maybe i misunderstood your question but i’ve also heard many say they weren’t getting all the content from the channels they subbed to exactly on the subscriptions feed. Personally i’ve never noticed this but that’s why some channels started recommending to also hit the bell.
I believe youtube-dl are just slower at accepting merges. For example yt-dlp were the first to mitigate youtube’s speed throttling and idk if the base project has it even now. It’s still functional but may be slower.