There are boss ultimate attack cutscenes that last 30s or more, and railed movement in some dungeons that are longer than 15s, e.g., the dragon ride in the last MSQ dungeon, and multiple spots in the Copied Factory, one of which, annoyingly, is a 15s ride that you don't have time to Soul after. Dropping Aspect during these is absolutely the job's fault. You can't plan for them, properly or otherwise.