I never go to my subscription feed - the front page algo keeps me up to date on any new content from people I want to see updates on. I’ve noticed too it almost has a “shadow subscription” where even though I am not subscribed to certain channels, it knows I watch every video by them so it gets on my front page too.
The front page really has a “vibe” that follows my interests around. Watch a few too many Minecraft videos or car repair and soon you start seeing more and more of the front page being those topics. Get a new interest in pyramids? Devlogs? Nature? The front page slowly decays old interests and promotes new ones.
Which is again why I don’t check my sub feed - it’s a graveyard of interests, many of which I don’t care about right now. The algo surfaces the ones I do.