I Think you need to look at FFXIV from a different perspective as to why classes and fights are design in such a way.
It is true that FFXIV gear is extremely linear. Jobs are pretty static. But what you get in return is the player being able to choose what to play and not worry about being a "bad" class. You get to play what you enjoy.
It also means devs don't have to worry about balancing every single possible spec, and instead on designing fun combat encounters and raids.
It is infinitely easier to balance based on FFXIV's systems and jobs than in WoW. Which ultimately also seems to fit with their philosophy, that the great barrier for entry into the content of the game, isn't suppose to be maximizing your class, it is suppose to be interacting with the mechanics of the encounter.
Of course then you have savage and ultimates where they can be more demanding in both regards of ALSO asking you to maximize your class and push everything you got, which again, is easier to tune towards, because you have a very defined image of what classes bring and how they fit into the game.
Imo FFXIV does a way better job than WoW there, gives you "different options" to customize it's probably the reason why WoW it's a NIGHTMARE about Classes Balance (not to mention how stressful and boring it is to obtain the gear you really wants). And what's the point to have "different options" if people are always going to aim the best ones for Damage?, "Multiple options" it's just a facade and a false variety. FFXIV had more options before and still have some with 4 different gears, materias etc. But in the end of day everybody goes to which one deals more Damage.
And hey, this game does have broken powerful systems, but they're in the side content such as BLU, Bozja/Eureka. There players have the freedom to change Lost Action specs or think of the most busted Blue Mage spell build.
Most of these can be found in extreme trials, savages and ultimate fights tho. I guess you want normal content to be more challenging? Also I don't understand what do you mean in terms of "minimal movement tools". We have jump, gap closer, back dash, rescue, sprint etc. A lot of mobility and movement to go around in the fight.
Now this I absolutely agree, we could use a bit more variety in terms of boss arena, not to mention that crappy website need a complete overhaul for a long time.