The problem is that it now takes the recipient 2 minutes to listen to your message, and can't search for it when they need to reference it again in the future.

The problem is that it now takes the recipient 2 minutes to listen to your message, and can't search for it when they need to reference it again in the future. If you literally just typed out the same words you spoke, the recipient can 1) interpret your message faster and 2) search for it and find it in the future. Removing those two features for marginally faster message composing just seems selfish and a waste of the recipient's time.