They are thinking about lightning as a L2 communication layer. As the common connective tissue between different scaling solutions rather than the direct point of end user intreatction and custody.
Discussion
So how people use bitcoin to buy things they need if not lightning??
There will be many L2s. Liquid, ecash, ark, spark ect. If a user is paying someone in a different L2 then the transfer of value will between the two will be in lightning.
If it’s in the same L2 such as liquid > liquid or a transaction within the same ecash/fedi mint then no lightning will be needed.