You can stop that from being necessary:
(1) Go to https://new.reddit.com/settings .
(2) Enable "Opt out of the redesign" ("Revert back to old Reddit for the time being").
(3) Visit https://reddit.com/ and you should then have the same experience there as when explicitly visiting https://old.reddit.com/ .
Of course, this is not something you can turn off in your preferences. You need to use a browser plug-in to do this.
There's an add-on to fix that! So whenever you click a reddit link you are automatically redirected to old.reddit.com.
I use the Firefox one, it works great:
https://addons.mozilla.org/en-US/firefox/addon/old-reddit-re...
https://github.com/tom-james-watson/old-reddit-redirect
Apparently there is also a chrome extension but I haven't tried it so user beware:
https://chrome.google.com/webstore/detail/old-reddit-redirec...
https://addons.mozilla.org/en-GB/firefox/addon/privacy-redir...
Supports:
Twitter → Nitter
YouTube → Invidious
Instagram → Bibliogram
Google Maps → OpenStreetMap
Reddit → Libreddit
Google → e.g. DuckDuckGo
They did: they decided they are their future.
You could write a userscript to automatically change all intra-reddit links to old.reddit.com, and redirect you to old.reddit.com if you land there from somewhere else.
I had done something similar long ago when I actually used reddit.
I have to assume it’s a very deliberate effort based on some business metric that the risk of losing people from the site is less than the profit gained from people on the app.