The moment the average Joe has to do this and that and look at that and this and be sure to balance a lot of things he normally doesn't give a damn about it's the moment the average Joe will say fy this shit ain't for me!
There will be wallet software which does all this for you in the background. Just as the average Joe doesn't need to know how to actually create or sign a transaction, or how to use change addresses, or how their private keys are derived, they also don't need to know how to actually open and close a Lightning channel. Their wallet will handle all this for them, and they will just spend freely and receive freely to the same channel without being aware of what is going on in the background.