The thing is, until very recently, Bot Framework was the only game in town for Teams.
Doing something as simple as sending an outbound message to a user from a bot, if the user didn't initiate the conversation, was stupidly convoluted.
There's some stuff added to Graph API for sending messages now, but on the whole, the development experience is very, very far from what I would expect from Microsoft.
There's still no good way to sign in on behalf of a user to Teams, which makes writing load-testing tools to test a Teams bot a PITA - you can use Direct-Line, but then it isn't really testing how the bot would act against Teams...
The thing is, until very recently, Bot Framework was the only game in town for Teams.
Doing something as simple as sending an outbound message to a user from a bot, if the user didn't initiate the conversation, was stupidly convoluted.
There's some stuff added to Graph API for sending messages now, but on the whole, the development experience is very, very far from what I would expect from Microsoft.
There's still no good way to sign in on behalf of a user to Teams, which makes writing load-testing tools to test a Teams bot a PITA - you can use Direct-Line, but then it isn't really testing how the bot would act against Teams...