If they applied the rules, I should also be able to "move through" friendly space regardless of the creatures sizes involved
Which is a valid complaint and something that was already pointed in the past, in fact.
Of course, to be clear moving through" doesn't mean they should be able to stop on the same spot.
I'm sure they could come up with a solution to make it look passable without having to deal with complex model interactions, if they wanted to. Something like "the two characters quickly dodging each other" as you transition in the same square.
If worse come to worst and it's a matter of saving budget they could also... You know, just not have any special visual effect for it and just allow playable characters to quickly overlap. It wouldn't be the jankiest thing in the game anyway.
