Droplets of water will lense light & burn the delicate leaves of a young plant. Thats why most foilar sprays have a wetting agent that stops beading.
Yes you can remove chlorine by boiling water, Fluoride too, which most tap water also contains, which is also not the best chemical for your plants.
But boiling water & then waiting for it to cool down again.... might as well leave the water sitting out in a bucket for half a day no?