I assume the problem with scaling furniture would be that any character *can* sit on the chair, so if you scaled it down to Lalafell size the game would still let a Roegadyn sit on it and there's no capacity for them to adjust their sitting pose accordingly. They'd end up with their feet in the floor. And probably the opposite problem where Lalafell "sit in chair" animations are designed to get them up onto a standard chair, so they'd dip into the floor before getting onto a properly-scaled one.
I think there could be some middle ground like a standard-height chair with a Lalafell-sized seat and no armrests so a larger race can still perch on it. Might still run into issues with front-to-back scale and where the backrest needs to be.
