What are the changes made to Magisk?

John Wu, developer of Magisk, published a blog [State of Magisk:2021](https://twitter.com/topjohnwu/status/1431889845199147008) , a couple of days ago which led to some confusion as to what is to be expected. Can the changes be explained in *non-technical* language? **Note**: This is a self-answered question as a reference, consolidating from various sources. Moderators are welcome to convert this into a wiki in case future developments are added by other users.