Imo I think they look cool.
Bahamuth for example looks unique and not like a generic dragon.
I actually think his protruding chest and how giant his body is makes him look regal.
It's also not like animals like these don't exist, look at giraffes.

I dunno tho I think some people just obsessively draw direct connections with real life normality and I don't rly get it or empathize with that.
For example one of my fav artists is Kim Hyung Tae, and some people hate his art because of the proportions of his character.
But it's not meant to look like a reflection of reality, and just because it doesn't doesn't mean that he's bad a anatomy.
Which is another thing I constantly see people blurt out at art and artists they don't like too, accusations that they're bad at/ don't know how anatomy works ( which in 99% of the cases come from people who don't do art and have never studied anatomy in their lives ).
The truth is that caricature artists are often times some of the most knowledge about anatomy, portraying realism is just not the point.

I don't think it's rly necessarily the same in FFXIV, but I do think that they take stylistic liberties that may not land for everyone but nothing ever will.
But my overall point here is that there is nothing to fix, it's not a mistake it's a deliberate design decision.