Posting a 3 coming on 4 year old post, of course it's not going to be accurate any more. And that's for the points that aren't just fear mongering in the first place.

• Redaction exists and removes the contents of events, while keeping metadata needed for the functionality of the room.
• Any program can handily ignore deletion - back when I used discord I had a handy plugin to view deleted messages for moderation, for example.
• Badly behaving servers can behave badly and it will not affect correctly behaving ones, they will apply redactions as expected.
• "Room joins leaves, etc are permanently a part of the room's history" well yeah, that's expected. You can upgrade a room if you want to start from scratch there.
• We can now prevent spammers from ever entering the room with join gates, among other things - but if you're not running a big public community, then our antispam tech is probably completely unnecessary for you
• Currently, timeline ordering is defined by the server. Continuwuity uses a simple, understandable and secure scheme - it orders by the time your server receives messages.
• As per the above point, this doesn't affect Continuwuity
• That's a tradeoff of allowing public rooms with tens of thousands of people in the same app as end-to-end encrypted DMs. Good job Matrix isn't really meant to be a Signal competitor.
• this point was relevant... Four years ago. You'll only encounter issues if you're using a broken server or ancient client now.
• "Started trying to filter recently" god you can tell how outdated this is
• It defines it pretty damn strictly now, and this isn't an issue in practice for a very long time.
• Mmm yeah I don't think you're particularly likely to experience one of those in day-to-day usage.
• and this is false lol
• Ancient and fixed
• False. There are many ways to do this.
• I've never encountered this, and it's impossible in new rooms versions.
• Aand outdated by years again
• see above
• see above
• see above