We followed this practice at a Non-Profit I volunteered for some years ago. For us, it was motivated by a few reasons:

- we trained the community around us to look to our website first for the most recent news and information

- we did not want a social media platform to be able to cut us off from our community (on purpose or accident) by shuttering accounts or groups

- we did not want to require our users have accounts on any 3rd party platforms in order to access our postings

- but we still wanted to distribute our messaging across any platforms where large groups of our community members frequently engaged

Another aspect of our process that was specific to our situation and outside of POSSE - we only posted one topic/issue/announcement per blog post. We had a news letter that would summarize each of these. Many organizations like ours would post summaries of many things to a single blog post, basically the same as the newsletter. However, this was cumbersome. For example, if someone in the community had a question, it was much clearer to link to a single post on our site that answered the question AND ONLY answered that question. It made for much better community engagement, better search engine indexing, cleaner content management, and just a better experience for everyone involved.

"we did not want to require our users have accounts on any 3rd party platforms in order to access our postings"

1000x yes to this! It can be really frustrating when a link takes me to FB, TW, IG, etc. - none of which I use.