This is the reply I was just about to leave as well!    In Settings.

But I still like the Twitter embed, especially for videos, so that I am not leaving SN just to see the contents of the Tweet.   It's only on the threads (and thus launching to a new tab) where I prefer to use Nitter.  

So maybe even if I have the Setting for auto convert to Nitter left off (disabled), I can still get the Nitter for it.  So for Posts that are Tweets, it remains the Tweet showing the Embed but there's also a launcher link/icon for the Nitter for that Tweet, so I can see the Tweet and thread in Nitter.

In the comments, same thing ... next to the Twitter link, automatically show a link/icon for the Nitter for that Tweet.

cryptocoin

Or an account preference you can toggle within SN

bitcoin

Should StackerNews convert Twitter URLs to Nitter URLs automatically?

Same. However, in the event SN doesn't want to implement this feature I would suggest checking out a "Privacy Redirect" extension for Chrome/Firefox that will leverage Nitter (and other read-only platforms for other social media sites)