There are accessibility concerns with doing that, if the poster doesn’t provide alt-text. Images are basically unreadable to the vision impaired.

I really like being able to confirm that something isn’t made up or blown out of proportion, being able to quickly check stuff like ‘how many people even agree with this take (a lot of times people leave out the engagement of a post)’ and ‘is this a genuine person in the first place (check out their profile or other posts)’ to not poison discourse with made-up issues
That said, as others in this thread have pointed to, libdirect should be encouraged so they can discourage traffic to the actual site
e: though nitter sadly seems to be out of commission for new tweets, rip