The GitHub Copilot integration is built by Microsoft and is present in both of the CE builds (IntelliJ and PyCharm). I'm not at all sure why they think it's not.

OP is correct about Docker integration and Dev Containers: they cannot be added to the free versions. Dev Containers specifically seems to be OP's big sticking point, but it's a weirdly pedantic point. JetBrains can't give everything away for free or they wouldn't be able to fund their development.

Picking a few professional-grade features and asking people to pay if they really need them is a totally reasonable approach.