There's no need to open a channel with the store. As a user, the minimum setup is 1 channel, to any well connected node. The software and the network takes care of the rest.
That doesn't mean you can't do all the configuration yourself, as you describe. But the idea is to simplify the process, what you've written is the most complicated way, and in the case of the channel with the store, unnecessary.
That's true... But in reality, if a store tells their customers to just create 1 channel to 1 node and fund it, they'll have to offer support if a route does not exist... They'll have a customer standing in front of their cash register trying to scan a QR code and getting an error message telling them (and the clerck) nothing at all... If a store just tells their customers to open a channel directly to their node, it would cut back on support questions immensely.
But, once again, in theory, you are 100% correct and if everything works and grows as expected, my version of the facts might be a tad to complex.
I'm running a LN for many months now, and i've accepted over 70 LN payments (not an impressive number, i know), but all of the payments came from customers that opened a direct channel between their client and my node...
