Should Twitter add an "Edit Tweet" feature?

I would structure my answer by thinking of following points:

1) Twitter's mission and goal

2) Target Users and their needs

3) What capability does the 'Edit' feature give?

4) What are the risks if the 'Edit' feature was made available?

5) Can those risks be mitigated?

If the answer is 'Yes' to #5, my recommendation would be to allow 'Edit'.

Starting with the #1: Twitter's mission and goal > is to give everyone the power to create and share ideas and information instantly without barriers.

2) Target Users and their needs: Creators and Consumers.

Creators - individual users or brands. Individual users are further divided into government officials, news channels, influencers who want to share their ideas or voice their opinions.

Consumers - want to react with their thoughts.

3)  What capability does the 'Edit' feature give?

Considering the creators segment and their needs, they will want to edit the post for following reasons: a) Typo - this is fairly common given the user is using this platform for instantly sharing b) Change their opinion c) Reword to increase/decrease the impact/tone/sentiment of the post.

4) Risks: #a seems a genuine reason for editing the post. But #b and #c could invalidate the entire tweet's orginal meaning and nullify the reactions/comments posted on the original tweet. This poses a huge threat to the fundamental existence of Twitter and lose it's credibility.

5) To mitigate risks of #b and #c, but still solve for #a, edit can be made available for a x time span and when there has been no engagement with the tweet. Assumption: that user will realise his typo mistake within a few minutes of this tweeting.

Hence, I would recommend giving the capability of 'Edit' for limited time period untill there has been no views & engagement (comments/re-tweets) on it.