As long as the table saw is properly aligned, a slight tilt shouldn't matter. @woodnthings
makes a good point - if the tilt is enough to affect the motion of the wood through the cut, that would be bad.
I have a SawStop cabinet saw. It is on a mobile base, and I roll it onto pillow-top paving stones outside to use it. The pavers have slightly curved tops with wide seams between them, The overall layout is barely
sloped for drainage towards the right side of the saw (in the direction of the rip fence from the operator's point of view). The saw does not always go in the exact same place. Different casters may or may not be on a seam between one session and another. The saw table is as flat as I could make it, and the blade and rip fence are properly aligned with the table surface and miter slots.
I used the saw today, so I moved it to its usual spot and measured the tilt, using a Wixey WR365 angle gauge. The WR365 can measure angle from Earth level to 0.1 degrees. (It also measures relative angles.) I made slight variations to the saw's reseting place to test with the casters, seams, and pavers in different positions. Each tilt measurement was taken with the saw properly settled on its base. The average tilt was to the right, between 0.5 and 1.0 degrees off from level. I found one position that had 1.4 degrees of tilt.
Minor tilt angles up to 1.4 degrees don't make a difference. Using this saw and other table saws that are level to the ground seem the same to me. My saw works well.