You might have skipped the patch notes in which they removed the cooldown from Pyroblast. The buff to ignite's contribution to pyroblast was to counter the potential nerf from the cooldown, but as the cooldown was removed, it is highly likely that they will revert ignite change as well, unless they plan to nerf some other spell to compensate. There are many options, it's best to just be patient ad way for the next ptr build.