An unmodified desk could have up to 3 inches of difference in height end to end, but to be fair the warped floors contributed to this more than the building structure.

> I can't imagine any change of tilt would be in any way useful.

It was somewhat useful for ball games.

I can confirm. Currently dealing with a lot of post WFH era back issues which commenced shortly after working all day from my 1890 construction brownstone apartment. The floor warping is real.