yes until the last tier in argus where the raid there will be the best place to attain the best possible gear. thats what its going to be though, until the last tier there will always be slightly better gear, even during the last tier you'll still be able to try to roll sockets/tertiary. not that it will be a massive increase but it'll keep the content worth doing.
i honestly don't mind the minor disparities between gear, the ilvl and stats have probably increased way too fast but they are obviously ok with the numbers for now. they have the best sim tools so i'm not too worried about 'the number are too big' if they need to crunch again they will.
rather than the content being balanced around certain gear, I think today its balanced around a specific output, anything more than that is gravy. because of the legendaries it has to be this way anyway, otherwise you would need specific legendaries to progress. where as you don't, you just need your raid to be able to beat the enrage and not die.