How come:
When you receive a text message you can see who sent it but you can’t see the number they sent it from (which would be real handy to compose a reply)?
One-time number marketing messages do not show up in the “Manage SMS” tab in the Contact record? (Wouldn’t it be good to see what you have sent to people??)
Yes, I put these into a feature request - a long time ago - but I see these as serious omissions from a really useful set of tools.