While the seen indicator is a legitimate annoyance, it's been commonplace for some years now. I don't know of a modern chat app that doesn't have it.
As for the rest of your points, Facebook's money comes from ads. These concerns are not limited to chat, but using Facebook in general. As you browse the web, Facebook is tracking you and using the data to deliver more relevant ads. As you comment and make posts, Facebook uses the data to deliver more relevant ads.
Every part of the service is designed to help them do this, saying that these are reasons to "not use Messenger" is missing the point. The point of using Messenger is that you're not tied to any other portion of Facebook. You just get to message friends, plain and simple. The benefit is you're not being enticed into scrolling your news feed, spammed with notifications about upcoming events etc.
Plus, there are rumours they're going to bring e2e encryption in a la Whatsapp, which would pretty much squash points 2 and 3.
Also, as an alternative, Hangouts stores my chat history in gmail (opt in), so unlike Messenger/Line/Whatsapp I have a history of all my chats on Hangouts which I actually find very useful.
That said, 99% of my friends and family are on FB Messenger
"Instant Messaging" indeed!
Spec: https://xmpp.org/extensions/xep-0301.html Demos: http://www.realjabber.org/
Not that Google (or whoever) are going to implement it now...
This is why Facebook is best used in an incognito-mode browser window.
I use multiple tabs with FB whenever I do have to use it, and private/incognito mode wouldn't work well for that scenario because it would force me to login in every tab. So instead I use normal mode with extensions to block ads, tracking cookies, social features on websites and Facebook Redirection (where clicks are handled by FB to track which site is being visited). This is with a combination of uBlock Origin, Privacy Badger and a few others. That way, I get to have multiple FB tabs but don't see my profile in the comments section on another site to allow further tracking. Any link I visit from FB isn't exposed to FB either.
I don't use those either. I stick to texting and iMessage.
> The point of using Messenger is that you're not tied to any other portion of Facebook.
You're tied to their ad platform. Whether you view those ads or not are up to you; but you are nonetheless tied to it. They analyze your private conversations with the eventual hope to manipulate you.
>3. They analyze said messages to deliver advertisements. Seriously, one time I mentioned buying a Samsung SSD to my friend in chat, and all of a sudden I got a ton of SSD advertisements on the sidebar. Same thing when I mentioned Rick and Morty.
These are poor complaints, unless your circle of friends is so insular on the the (justifiably) paranoid side of tech that everyone is running their own mail servers and using GPG day to day.
Are your friends all Tor developers or something? I just can't imagine a set of family/friends/acquaintances who actually run their own Postfix and care what a public key is.
I'll accept the existence of an advertising profile (I don't see the ads, anyway) before I'lll cease all communication with everyone in my network, which is what it would take to avoid Facebook (or the exact same problem with a different company).
iMessage is nice, but many of the people I converse with regularly aren't in the Apple ecosystem.
I'd rather give my conversations to a company that sees storing/processing messages as a liability, rather than an asset.
To answer that question, I opted to list personal reasons why I don't use it; reasons I'm sure are shared by many. Your response is basically telling me my experience and opinions are wrong.
...Especially when you're trying to convince someone who saw it with their own two eyes.
I don't use Facebook enough to care; uBlock Origin suits my needs just fine.
For point 3, Facebook could still be analyzing the contents of messages.
1. The mandatory "seen" indicator
2. All of your messages are beholden to a private company, permanently stored in plaintext
3. They analyze said messages to deliver advertisements. Seriously, one time I mentioned buying a Samsung SSD to my friend in chat, and all of a sudden I got a ton of SSD advertisements on the sidebar. Same thing when I mentioned Rick and Morty.
4. It's Facebook, for crying out loud.