It's not just companies that want to MitM their traffic: consumers want this too. Otherwise all the IoT devices in a house will no longer be trustable: Alexa can start uploading everything it hears, even if you never said "hey alexa!". And because of forward secrecy, you can't verify what it did or did not send: it all looks the same.
This expands to any IoT device with proprietary software on it, which by 2023 will be quite a lot of things.
This expands to any IoT device with proprietary software on it, which by 2023 will be quite a lot of things.