Indeed.
He could, but (a) he'd have to coil up an awful lot of cable if he has no idea where the lights would be and (b) as sparkwright has just reminded us, he apparently only has small conduit in situ to the switches, which presumably could not accommodate the two cables that would be required if power were to be looped through the switches - so there would then have to be supply looping through the lights.
Indeed - I'd forgotten that. Provided the big JB can remain accessible, I see nothing particularly wrong with what the OP originally proposed. A good few moons ago, I had such an arrangement for most of the lighting in a previous house.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local
