What about jobs whose rotation gets majorly screwed over if downtime happens at inconvenient times, such as Bard or Summoner? Where optimization has to be harsher and done more in advance, netting in a large loss just so everything lines up perfectly later. You're basically forced to rely on Ruin 3 and Burst Shot. If downtime is sufficiently large, then it can interfere with Coda, for example. Or worse, Hydaelyn EX where the add phase now goes by too quickly, messing up gems and demi-summon timings.