Frankly at this point, why are people complaning about this now?

People have had several years and opportunities to take the side routes for extra experience and gil. Yet many players still take the shortest route just to clear the dungeons, rewards for going to side rooms be damned.

The devs saw the pattern and ultimately made hallway dungeons the norm ever since patch 2.2.

At the end of the day, players tend to take their rewards and opportunities for granted they way they have been. As a result, dungeons are ultimately the hallway corridors we see now.

I guess people end up reaping what they sow for faster dungeon runs.