That said, posting links to original content tends to get low engagement and is generally disliked on downstream social networks. It is often seen as not really participating in a native social network, instead spamming it for the sake of self-promotion. Even if the link is promising/worthwhile, the UX sucks. As it will be typically be consumed from mobile, it opens an in-app browser, your website loads, possibly with all kinds of distractions like cookie banners or a poor reading experience. Should your link contain yet other links, the experience pretty much breaks down.
Any feedback from downstream systems (likes, comments) are not syndicated back whilst at least for comments they can definitely enrich the content. Unless you have some very sophisticated polling mechanism, that content does not syndicate upwards. Similarly, if you reply to somebody else's content, your reply in a way is also your original content, but it's not preserved on your blog.
Should your link really have a high value, definitely don't expect that people pass down the link in distribution. They'll take quotes and make screenshots and post it natively.
Nitty gritty local cultures matter. On Reddit just posting the link may get you banned. On other networks you need to pay for API access. On Medium, you shouldn't post short form, on Mastodon, you might need a content warning and hashtags.
To handle the feedback of your syndication, you continue to need to deal with every local network personally. Manage their notifications, handle their replies and follow-ups. Your friends/followers are also not syndicated.
When using native social networks directly, people often use multiple personas. The standup professional on LinkedIn, but also the toxic gamer dude on Twitter. Same person, different masks. Or even multiple personas within the same network. Very hard to setup with POSSE.
Say you'd participate in a "#catphotooftheweek" competition that only is a thing on Twitter. You can post it on your blog but it makes no sense there. Syndication should only happen towards Twitter.
Anyway, like I said, better than nothing, but automated syndication often sucks. The content ownership part is the truly important part. You can most definitely consider syndicating manually, in optimal form per social network.