Flamethrower back in Stormblood used to generate heat (as it was an integral part of the rotation at the time). Removing that just shifted its usage down, and shotguns just make it a less viable option. Maybe it's time flamer generates heat and refreshes double check/checkmate when it pulses out, and/or burns off bioblaster's dot. Couldn't tell you what it needs, but until it has more or does more damage, it's just right on the meme ability. Which it's funny to say something like meditate has more of a use than flamer does.