You clearly have too much time no your hands for polishing emails.

Remember: the Germans lost the tank battles in Russia during WW2 because they were not able to field as many tanks as fast as the Russians. The reason was their exquisite quality assurance: when tanks were delivered, even the paint had to be perfect. By contrast, the Russians often fielded partially painted, or not even completely sanded tanks. And won the war.

Emails should be brief if they communicate something simple. If you mail the description of a complex problem, IMO it makes little sense to copy it to a document and attach a document - you just add another hurdle for the recipient. In such cases, a long email is unavoidable.

Besides, if you're writing a lot of email you're doing something wrong. There are wikis, issue tracking systems, forums, collaborative documen editing systems etc. which are way better than email systems for lots of operations. And there's also chat and phones. It is abnormal to have emails by the dozen every day, unless it's just automated notifications generated by dedicated systems.