I throw up this phrase for discussion. It is not targeted to clearing groups, because they can do whatever makes fun once they have a turn down, but it is targeted to progression groups.
As you can see on Coil Savage, the "dev-intended" way to do Coil is the common 2-2-4 setup. However, it is also common to do 1-2-5 for T8/9 progression. IMO, if your party requires such setup, at least someone is not pulling its full weight. I encountered this with pugging T9 apart from my static raid, e.g. "Can you solo heal First/Golem phase, because we need our SCH to DPS to get golems down fast enough / to only have 4 Meteors, ..."
Yes, I can but in my mind it only means "if your party REQUIRES the SCH to DPS, your DDs are mediocre", however I don't complain when I'm a guest.
In our static, with many weeks of progressing on T9 (due to person exchange, vacation, real life stuff...), every single person of our group learned very much about his class to maximize its output, thus we're able to do 4 meteors, 1 add with the standard 2-2-4 setup with everyone having 110 weapons. But it took us really some time to get on this level of playing while getting used to the mechanics.
What is your opinion or what does your group do? Sticking to 2-2-4 and practicing on the weak links, or switching to 1-2-5 to get the kill done asap? IMO if you have a weak link, it has to be stepped up and you shouldn't rely on your group members to compensate for you. I mean if your group is not strong enough to get 1 but 2 adds with 2-2-4, then I think it is ok, learn how to handle 2 adds instead of forcing 1 add with another subpar group setup. When we were progressing we made a strategy how to handle 2 adds and now with being able to push 1 add, we made up another strategy but never moved away from 2-2-4 to force 1 add from the beginning.
As said, this is not targeted on clearing groups but on progression ones.
As a result for me, I won't pug or be a fill-in on groups which require to use the non-standard setup, because I can assume their DDs aren't on their A-Game.