I feel conflicted with this view. It feels partially like something social media giants would advocate, the idea that their little social media platform is some special community where people are different and normal open web rules shouldn't apply.
I feel the philosophy of posting on the web and hosting your own website is that the web is the community with which I want to share my thoughts. If I just wanted to share my thoughts with just one platform/community, I would go and just post it on that one platform, I wouldn't go to the trouble of running a website.
I get that it's important that there's safe spaces, and some communities should be like that (essentially, private but online) but that view should be the minority and exception for edge cases, rather than the default view of all different websites or platforms.
I also find it ends up looking rather spammy. A blog article is written, and then it's posted everywhere in an attempt to drive traffic to it. It's often hard to see a difference between someone practicing POSSE and someone spamming in an attempt to help their SEO. This is especially true of 100% of their posts are just links off to the blog, where they treat all the social platforms like alternate RSS protocols.
A social networking site designed around POSSE may be different, where you can subscribed to your blog as a means to post, and the post shows up as the RSS would in a feed reader. This way people don't have to click through to read what was posted, or can at least read what is above the fold. This can be rounded out with comments, one-off posting, and maybe some standard way to write a blog post that references another, for a proper linked/threaded response for more thought out and thoughtful replies than a short comment.
I fully accept that my view may be dated to the point of having inverse consequences (maybe in line with what you're saying). But, there's just no getting around the feeling I get when I see the exact same post, in the exact same context, showing up on every platform I use. There's just no way that can't feel like spam. And when I do it, it feels like I'm spamming people, too. Having come up in the blogging days of 2003 on, I'm just sort of programmed that way now. But, like I said above, I get why people do it.
Side note: It's such a bizarre thing that the platform you're on matters at all. Not without reason (they all have a vibe now, that's basically politically informed). But, back then, you were just on whatever blog platform was the easiest. The platform was more or less invisible (or at least ignored).
I definitely relate to that feeling. I miss the days of forum signatures which felt like the perfect solution.
And funny you should say that side note, I also agree. A relevant observation/recollection a few days ago:
> there was a time where social media platforms were defined by their features, Vine was short video, snapchat was disappearing pictures, twitter was short status posts etc. but now they're all bloated messes that try do everything.
I feel blogging was one of the main platform and the main feature in the early 2000s. There was a period from mid 2000s to mid 2010s where there was a separation between platforms and features, and now they've reconsolidated into all platforms having all features... I think? I don't really follow/use social media much, I've not used TikTok but I guess it might break the cycle.
I feel the philosophy of posting on the web and hosting your own website is that the web is the community with which I want to share my thoughts. If I just wanted to share my thoughts with just one platform/community, I would go and just post it on that one platform, I wouldn't go to the trouble of running a website.
I get that it's important that there's safe spaces, and some communities should be like that (essentially, private but online) but that view should be the minority and exception for edge cases, rather than the default view of all different websites or platforms.