Propose altering the default of send notification to contributor checkbox on cancel or edit recurring to off
When cancelling or updating a recurring contribution there is a checkbox to notify the contributor - this is checked by default.
I use this form a bit as a 'user' and often forget to uncheck it - which results in a pretty mindless communication going out for what is usually either being done as part of a chain of communication with the donor (it's redundant) or an administrative change (the next scheduled date needs updating due to some oddity).
Because it's a rare-ish flow and 9 times out of 10 I mean to uncheck it I have never bothered to edit / maintain the message template.
I realise that I could add an extension to change the default - but my gut is that given I've seen it be problematic on 2 out of 2 sites it would probably be better that people actively choose to check the button rather than have to remember to uncheck it. If you forget to check it it's easy to send a quick email but impossible to recall if it you forget to uncheck it.