A few quick searches show there’s plenty of information that answers some of the questions posted in that thread: about security of ecloud.global, self-hosting /e/cloud, how to build the /e/ ROM and a huge list of how-to made by the community.
This is some information about the /e/ app store, which according to this post is one day behind F-Droid and Google Play.
But there are still no independent audits, only reviews made by others and not all of them very technical. This is also one of the things that I would really love to see, an official audit of the service assessing if it’s fully un-Googled and also how secure it is.
Overall I agee there are many downsides to /e/ to this day, as with any project, but nothing that I personally find a deal breaker. There are many things to improve, but it works and is fully usable. It’s still a very young project and as far as I’m aware none has tried to do this before (bring the whole ecosystem experience out of the box) so kudos for that.