With version 10.3.1720 (b574c3b), I was able to define shortcut keys for tags:
This was so useful as I come from Postbox where I had this defined.
But when I start writing a new email, number keys 1, 2, 3 don’t work in the body of the email 
They work in the To, Cc, Bcc fields and Subject field.
Bug? Feature? 
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Hi, I forwarded this report to our team so we can get it fixed, that definitely does not sound like intended behavior 
Any updates perhaps on this topic?
We have been able to replicate this issue on Mac and are working on a fix. Unfortunately, I don’t have an ETA on when the service update will be ready to go out yet.