Philos at the end of those two story dungeons are there as an incentive for players that have already done them to come back and help those who haven't while having a nice reward. They aren't there to be farmed while ruining the experience of those same people that they should be helping. You're free to speedrun them if you want and nobody is going to stop you, but FFS, stop using the Duty Finder for it. People new to those dungeons are most likely to not have a FC to make a premade, but you (supposedly) do.
It's sad, but it seems that those days of players helping each other just for the sake of doing so are long over. SE was wrong to assume that players would be nice and would be willing to help, but that doesn't gives you any right to act like you do and drive people away from the game with your attitude.