moshe
i think thats just about exactly what i said. the “intent may be evaded”
the kosher lamp is not the evasion of the law forbidding the turning on and off of a light. it simply has nothing to do with turning a light on and off. it is blocking a light. there is nothing assur about closing your window shade. closing your window shade is not a “loophole”
blocking a lamp light is not a loophole either.
there is no intent to get away with performing an assured act because the Rabbaim forgot to state something in the law. that would be a loophole