Apologies if this doesn't fit here, not sure where else to post something like this on lemmy
I think having gravity act like weather might be an interesting concept for a fantasy world, where each country has its own gravity patterns, some tend to be heavier some tend to be lighter, some are all over the place
For a few examples, there could be a desert with gravity so high you can get dragged down into the sand
Could be a country with gravity so low everyone uses personal aircraft that work like bicycles instead of land vehicles
Animals in higher gravity areas would have less dense bones, more muscle, etc and lower gravity would have far larger animals because they can support more weight
In a really high gravity area people might need exoskeletons to prevent long term damage
There are things that can be feasible adapted to by a species and things that can't. If you want, you absolutely can have it be that some places humans cannot really go to, just as there are magma fields that have existed for a very long time and that doesn't mean humans can live in them, or pockets of virulently poison gas around certain sulfur deposits that will kill you instantly if you inhale that have just been sitting there since time immemorial. Or, you know, the deeper parts of the Artic and Antartic circles.