I've personally come to find the world of Eorzea very sterile and honestly kind of dull. Don't get me wrong, the world design is absolutely stunning, but at the same time it feels about as shallow as damp grass.
However, a lot of the features I enjoy seem to come across completely different to other people. There's nothing wrong with that of course, everyone has preferences, but I thought it would be interesting to see not only where you stand, but why you feel the way you do about certain things.
Things like:
Numerous, unique aggro mechanics (Sight, sound, smell, blood, magic sensitive etc)
Timed travel (physical airship and boat rides)
Mob characteristics (In 1.0 certain mobs had unique features; Aldgoats were curious and would follow behind you, crabs would raise their claws and warn you off before aggroing, Does would flee if you drew your weapons, slugs would use their AoE if you stepped on them etc)
Rare mobs with unique spawn conditions (Moon phases, lotto spawns, pop items, weather based etc)
Elemental and damage type weaknesses and strengths (Puddings being all but immune to blunt damage, elementals absorbing their matching elements etc)
Weather types effecting combat (Thunder damage is increased during rain etc)
I know those features can cause certain inconveniences and play a part in class design, but it just feels, personally, that ARR is so sterile and standardized to make class balancing and progression as simplistic and bare bones as possible. Just results in there being nothing to really sink your teeth into. To me, being immersed and appreciative of the game's world is far more important than grinding AK run to get another tier of gear with minor stat upgrades