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You're assuming that most users want to edit the subject of ongoing threads (and thereby break the thread.) I have my doubts it even occurs to most them. So not

You're assuming that most users want to edit the subject of ongoing threads (and thereby break the thread.) I have my doubts it even occurs to most them. So not having that option visible makes sense. I understand what you're saying about hidden options being unknown, but generally overall cognitive load is one of the biggest issues for new users and one of the best ways to mitigate that is to remove visual complexity.

davidsturnbull 13y ago
Changing the subject should not break the thread. Thread displays should be generated by creating a tree out of References mail headers.
Ensorceled 13y ago
That's another bug in Gmail. If I send two emails to two different people titled "Proposal" they get threaded. Thanks Gmail!