Microsoft bundles all of their software in a way that makes it much more expensive to pick and choose which software you want from Microsoft and which one you would want from someone else. It's a very similar strategy to that of Adobe.
When I used to install collaboration systems, the main thing clients would tell me why they chose say a Logitech Rally with MS Teams over Cisco and WebEx was it's cheaper. With that said you can setup a Cisco Room Kit with Teams integration.