My problem isn't really with single target encounters, boss fights in 4mans are perfectly fine as is - in fact, I think the 2nd bosses in all of the new dungeons are great. Even doing these as quick as possible requires mastery of your job or at least your rotation, so there is no real problem with repetitively doing Primals/Coil/etc. However, trash is trash - in pre-50 dungeons it mattered more since it gave you exp, so skipping stuff wasn't really beneficial to you. At 50 you have no reason to bother with trash, so burning it down and getting through it as fast as possible to get to the boss that actually requires at least a little bit of concentration is optimal. Slow or fast, it's going to be the same trash with the same auto attacks and random melee AOE cleaves/circles. While I agree that the combat is fundamentally boring, I don't think this has any effect on trash in dungeons. Even with the most unique skills, you'd still just be burning trash. If they gave trash any sort of meaningful mechanics, like the bees in pre-nerf Qarn, then i'd be fine with how the dungeons are gated to stop speedrunning, but as it is right now there might as well be a path straight to the boss with buttons you have to press along the way to open doors that are just in the way.