you don't get my point.
everyone and anyone will benefit from anyone or everyone else commenting in his photos, so long as the intention and starting point is a genuine and sincere one. there is no so-called division between so-called seniors or juniors or what in my book. what basis is there for the denomination here you propose? age? experience? all that count for naught, what matters is the end result we see here. if the so-called senior is commenting to put people down, it is obvious and one should just ignore him. if the so-called junior is commenting and spouting ignorance, then one should just as equally ignore him (for example, calling an infrared photo "excessively manipulated" when that is an out-of-camera result) because he does not know what he say.
art is subjective, but if only the artist understands his art, then maybe the artist should wonder if he is using this "art is subjective" tagline to prevent a convenient excuse to be exempt from criticism. there is art, there will be critics, there will be comments, there will be judgements. are you telling me that you can look at something that someone calls "art' and feel nothing about it?
another question - if your art has no one around to appreciate it, then have you heard of the phrase 孤方自赏? what is art that only one person can appreciate?
i am sure people are going to move out old skeletons, misunderstood artists that became popular later on, and then use this to provide excuses as to why their work is art, and no one should comment on it because art is subjective. then my reply is simple - those artists got negative comments, later on their work was realised.. won't the success be sweeter then?