Others have explained about not being able to see all content, profiles and such.
I’ll add another reason why I redirect to it: XCancel is/was a lot faster than X and had IMO a much cleaner UI, especially when reading larger conversations or groups of tweets. I don’t browse X much, but I already have an extension installed to redirect certain sites, so adding a redirect was an easy win. I’ll miss it.
You need to be linked to specific tweets to know where they are. You can't just open up a timeline and read more than the last few posts (literally like 5, including any pinned post.)
That is the point. It's a way to get the value of a service you don't like, while signaling to everyone that you're too virtuous to use the service you're getting value out of.
I prefer not to share links that require the people receiving the link to create an account to read the content and it's replies or post to such websites for that matter. That's basic netiquette.
So that's supposed to be the motive? Frankly I think most users just see it as a path of least resistance to a tweet. You guys really aren't familiar with this Internet thing.