I agree. TOS has some interesting characters and fun moments, but I just can’t get into like I get into TNG. TNG is a series I can watch start to finish and all the movies and then start right over and watch it all again. TOS is one I might re-watch every 5+ years to refresh my memory, but I’ll put it on exclusively while I’m doing something else so I don’t waste my attention. My Dad loves TOS and TNG, and regularly references TOS, expecting me to remember episode names and whole plot lines. Oops.