Except a traditional world map and an open world are two completely different things. Before XV, FF had never been open-world. Sure, you had relative freedom in roaming the world map, especially if you compare that to X or XIII, but you still really only had access to a very limited space between various points of the plot.

I'm pretty fresh on this, since I'm doing a marathon right now, but take a look at FFVII. After you leave Midgar, you find yourself on the world map, but the space you have available to you is not that large and the only place you can really go to is Kalm. Sure, you can sequence-break and go visit the chocobo stables first, but that will still get you nowhere. Not to mention that the world map is not an actual open world in the sense that it's a scaled down represenation of some parts of the world, something that is completelyu different to XV's design philosophy.

So yeah, people who enjoyed the old world maps won't necessarily enjoy XV's open world because it's a completely different thing when it comes to player experience.