So, you have hundreds of subs but only care about a hundred of them, and that's YouTube's fault?

Why do you subscribe to channels whose content you don't watch?

He wants to watch them, but doesn't care if he misses any since they put out so much. Compared to the other ones that don't put out much and he never wants to miss.

Youtube’s fault is that subs get sorted at random and you have to scroll through to see that blue dot. It is hostile to a user by design and will never make pinnable subs or sort/grouping modes.

I don't have this particular problem, but maybe they want YT to support these creators, even if they don't have time to watch it all.

> maybe they want YT to support these creators

or maybe those creators brings more money to YT...

Newpipe takes care of this pretty well. You can select what it calls "Channel groups", which would be a feed of a subset of your subscriptions.

You could use separate Youtube channels for this. Use one to subscribe only to the infrequently releasing channels.