Odd resurrection of thread :- )
I would not look too deep into lack of interaction. Specific platform forums were dying breed 6 years ago, and they are almost completely dead nowadays. If I look at CGArchitect, I see like 5 people writing 5 posts per year, so Corona forum is in comparatively good shape. What I am saying, even due to origin of this grumpy thread, there never really was any policing against simple posts (there are like two mods here and they have other worries).
Almost everyone and everything gets ignored here outside of few occasional bubbles of interest. In this day and age, everyone needs to create their own audience in whatever way they are capable of doing. From 2012 when I begun, I've seen the shifts from Forums (CG Architect, CGTalk, Evermotion,etc..) to social medias (Facebook), then specific platforms (Behance), then back to social media (Instagram,...). It's fickle ever moving train. I don't think we'll see a resurgence of some tight-knit community spending time giving constructive feedback to each other. I think that train is definitely gone. Dead.
And I wouldn't look at the other platforms for constructive feedback and authentic support either. It's pretentious rat-race, even with 100 thousand followers on Instagram for example, 99perc. of the audience would give you "Nice work!" but they wouldn't even mean it, it would just be copy&paste to manipulate you into looking at them (or just bot). At least "Nice Work!" posted on forums actually means the person liked it, and it was probably real person :- ).
Not like the feedback given by random strangers with specific tastes and little understanding of artist's intent was ever valuable or something. Most of the time it's unsolicited crap. And that leads to my final point: It's best to be one's own critique, or create small community of close friends& acquitances you trust to give you good feedback. When someone you trust tell you the composition isn't working, it's much better than "Random Johny" telling you "haha, your chair is floating 1 cm above floor, see ! You're not so good and I am very smart to notice random unimportant shit!"
Definitely continue to post, perseverance is most important, most people here can't tell stranger's gender and even the most interesting posts might not stir attention. You could post the most beautiful archviz work and some grumpy cat would come tell you "another building ? I would have liked more star wars ships". Just post away and don't give slightest fuck.
PS: Or maybe we should all finally move to Reddit ? I can't wait for all those "Fellow Coronauts, I am the only one thinking....(plz click to actually read total nonsense)" :- )