I have found that there are *way* more ad insertions when I watch Youtube on my Roku TV vs. when I watch on computer (or phone or tablet). It is so bad that I completely stopped watching Youtube on the TV. Watching in a browser on a computer is much better experience.Sounds like it's not a very smart TV. On mine I can subscribe and check on channels I'm subscribed to. I'm not sure if I can "click the bell thingie." But beyond that, yeah, I have to switch over to a computer, or at least a phone.
Maybe not as bad on other Smart TV platforms.