These extensions is a different issue, these are just additional functions that they wanted to provide through partners because they don’t have the resources to do that on their own. And they can’t change their business model. However, there is no lock-in, you can use a different office suite (collabora, it happens that they have similar limits) or once there is a different competitor, it’s possible that they implement this as well. You can run your own talk server (HowTo: Setup Nextcloud Talk with TURN server), you can compile the office suite without limits.
So I think it is better to have these options (with limits, either with pre-compiled limited version, or with more complicated setup) than not having these options at all.