When a person hits that subscribe button they are saying, I want this person's content... not I want you @Youtube to decide what portion of content I get.... C'mon guys, to subscribe is an action, which means that sub is saying, give me this content
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plus most of the time we never see any videos from any channel we're subbed to due to this system... it's dumb if i chose to sub to someone i should be able to see everything in the subcription feed section