I don’t know how to reconcile these statements.
As for your other question, obstacles should not be drawn connected diagonally.
Programatically, you can block diagonal movement/vision by checking whether the adjecant tiles are blocked, so NE is blocked if north and east are blocked (from the characters perspective)
But honestly I think the game shouldn’t have overcomplicated movement mechanics. From my experience, it will just cause more harm than good.
Yeah, the movement is an easy fix anyways. The targeting and damage gets trickier though. Projectiles would still be able to travel through diagonals and enemies could still target diagonal tiles. Really sounds like too much work for something that cant be fixed.