Agreed.

Especially #2, all the top executives are very good at crafting their emails and they triple check/read over before click send. In a couple instances, my boss pulled me into his office and asked for my feedback on an email he was about to send.
Another thing is don't ever expect people to read your emails because most people don't get to read everything in their inbox. Almost always better to call to send a message or explain certain things.
If you do need to send an email, make sure it's concise.