As far as I understood a LN Channel is open and closed by their participants by broadcasting and confirming transactions on the chain, so they only pay those transactions fees and not all the other they may do while the channel is open. If that is right, the LN would work only for recurrent payments and not occasional transactions, right?

If I go everyday to the same coffee shop it would be worthy to open the channel with them, but not if I'm passing by one and decide to make a one time purchase. It seems that we are putting to much hope on the LN, but it wont solve a lot of problems. Is there anything I'm not getting right?