Thankfully there are still enough channels which are not that optimized.
But I wonder: How would the scene of Youtubers cope, if Youtube suddenly changes its algorithm to something completely different? I remember the tears in SEO-land, when Google did it.
Having a small backlog of video files in the file system shows how great file systems are compared to a subscription feed on a web site: You can pick and choose your next video, you can sort by different criteria, you can tag then and/or put them into folders and you can do that all one the fly.