Hey, I'll join in!
I will say that POTN has been a great place to frequent over the years! A few reasons: 1) It's a great place for sharing and getting valuable info and inspiration, both regarding photography (of different sorts) and also regarding the "stuff" we use, both the gear and also the post processing tools we use (what some us call "The Digital Darkroom"). 2) POTN is a great place to talk about all this stuff. In that sense, it's what you could call a "Photography Social Network". In that sense we are inclined to be friendly and, supportive toward each other, rather than being focused on criticizing and fault-finding... 3) POTN is indeed a great place for sharing photos! Heck, we have super photographers who share, active professionals of various fields, people of a strong "artistic" bent, and then, likely the majority, those of us to whom photography is a passion, but not a profession or an artistic "specialty" (although that can come with growth), but we all like to Share, both our photos and our thoughts, and we are often not interested in the "C&C" side of things...
And then, you ask about the "C&C" aspect. Well, yes, people do post and ask for "C&C", sure, and that's great that people are looking to improve! My one practical suggestion would be to spend time in the Critique Corner here:
https://photography-on-the.net/forum/forumdisplay.php?f=12
People in that sub-forum do take such stuff seriously, check it out...
Also, there are threads devoted to Post Processing topics, found in the RAW, Post Processing and Printing forum here, topics covering a range from straight RAW processing to producing Composites, and everything in between, and we have some active discussion in those threads...
But as to photo "Sharing", in sections such as the "Landscapes" section that you posted in, well, I'd say the fact that we've leaned toward being a friendly and supportive gang rather than a bunch of died-in-the-wool critics pretty muchspeaks for itself...
So, if you want serious C&C, like I said, check out the "Critique Corner"!!!