Might as well delete your account now. Reddit Inc. won't learn, they only care about their IPO, and making it profitable in the short term. The likelyhood of them going "Ok, we hear you and from now on we'll focus on our users' needs instead of quick profits" at this point is close to zero.
The way I see it, the function of this protest is to make a warning example of Reddit, so that other companies can see what happens when you bite the hand that feeds you.
You can buy all sorts of stuff if you have money burning in your pocket, but as far as essential goes, you've already got it all.
That said, you might want to get a multipurpose USB-C dongle, for connecting the deck to an external display, keyboard, mouse, ethernet and such. The Deck Dock is okay, but there are cheaper options with the same functionality.
why would I avoid it?
To show your support to the blackout while it lasts?
It's a bit like going to work despite the strike.
It's ironic, because the WWW always was decentralized by nature. Websites were people's social media profiles and decentralized platforms. Email was the decentralized instant messenger. But then business realized that it would be more profitable to sell ads if they can target them, and targeting only works well when the users stay on your site, and not someone else's.
I can't blame the people for flocking into these walled gardens. They made a lot of sense in the beginning. Instead of having to learn how to code (or use MS FrontPage, and figure out wtf is an FTP), you could just click a button to insert your photo on "your" profile page, change the texts, add some links... Ease-of-use is a major driving force when it comes to mass-adoption of technology. Companies do this well, because they recognize this issue, but the FOSS community tends to be too homogenous and tech-minded to execute it as well as commercial players do, because they operate largely on a volunteer-basis, and aren't exactly easily approachable by folks who aren't tech-minded.
But now we're getting to a point where all this has gone a full circle. The overwhelming majority of websites have evolved to have horrendous UX, because money and the marketing dept. speaks louder than users' needs. And now the users are slowly beginning to realize that these companies don't serve their interest like they did 10-20 years ago.
With some luck, the open, decentralized models will gain more traction again, as long as the people making the software manage to attract UX-people and designers.