Every time I send an email from the comments tab of the task, I have to
manually
:
  1. Come up with the email subject (usually copy-paste the task name)
  2. Add a link to the task in the text and provide some context; otherwise, it's not clear to the recipient what I'm talking about.
Instead of doing it manually every time, I'd expect my comment to be wrapped into a professionally designed template, which would include the most important task properties, and clearly show that this is my comment to a specific task.
I would also expect the subject to be prepopulated with the task name, for example, and be able to change it if necessary.
P.S. I see it has already been suggested, but marked as "not on a roadmap" long ago :(
I believe this could be a great quick fix that would make this part of UX much better for both senders and recipients.