How it used to be...

[Kaethra]

You'd have to play very little XIV, or be some manner of TT/LoV/BT/GS competitionist, for the majority of your time spent to be in solo content, let alone 80% of it.

The same is true of WoW, Rift, GW2, B&S, Neverwinter, and (though more variably) PoE.

I should have been more specific with the focus of the devs being on solo-leveling content.

You can see it here in ShB. Look at all the new zones. All that is for 70-79. The 8 dungeons and 3 trials together pale in scale to even one zone.