There's something to consider here: the game reached a stage where intermediate gear is becoming relevant.
In 2.3, you could get some nice i90 gear in almost no time, thanks to the Hunt and the myth tomstones raining from the sky without much effort.
Being i90 in the 2.3 era was good enough to do most of the content without too much problems in order to start getting i100-i110 stuff to do Ex Primals and Coil.
So, long story short, you could very easily jump from i50 to i90+ stuff in almost no time.
But now, things have changed. Getting Soldiery is harder than previously and you can't really gear yourself up with the Hunt anymore (or, at least, not as easily as it was in 2.3). Since you won't be able to really farm Poetics if you are freshly 50, and that it your take quite some time and investment to get Soldiery i100, you have to find something else between your i50 and the i100-i120.
So, what's left? Well, if you are a fresh 50, chances are that the market boards are not available to you, unless you made a ton of gils in some way. Therefore, the only real things left are: dungeon gears.
You'll now have to farm some dungeon to start getting your iLv up with intermediate pieces of equipement such as the good ol' Darklight and the i80 stuff. Only then you'll be able to go into CT1, get some more gear and then start doing CT2 in order to get closer to i80-100 to start farming Soldiery efficiently.
I think the way 2.4 made the gear evolve, but also the way to obtain it is very clever. It give a fresh new use to the abandonned stuff below i100, which was completly ignored during 2.3.
By adding new content and raising the difficulty of obtaining the new "i100-i110 base", SE managed to bring back old content into the scene for fresh 50 players to use... personnaly, I find that very well done.
tl;dr: People now have to stop thinking that running dungeons for i70-i80 stuff is useless, because that stuff just became more relevant to the character progression towards end-game.