This was/is a long standing feature request to block podcasts and video podcasts completely. Even worse two years ago unrated podcasts were available to kids. Not quoting the stuff I could find there. Highly unsuitable to kids.
I actually love SoundCloud's timestamp based comments. It is pretty fun seeing someone's joyful reactions to a nice drop, beautiful vocals coming in, a brilliant lyrical phrase, etc. It's disappointing that this is not the primary mode of commenting on Spotify.
Nobody stops to think "why not" when it is so easy to add certain features to software these days. But everyone wants to capture peoples attention and adding messaging is one way to do it.