> Easiest way to avoid that wobble: get the legs to within 1 mm, add felt pad to the bottom of the legs. The pressure of the table will compress the felt and all four legs now contact the ground.
On a level floor, sure. But for something that will be on uneven surfaces, like outside, 3 legs are stable, even if the legs are all different sizes[1].
[1] Three points make a plane, the plane itself may not be level, but because all points of contact are on the same plane there is no wobble. When there are more than 3 legs, some points may not be on the same plane, producing a wobble.
On a level floor, sure. But for something that will be on uneven surfaces, like outside, 3 legs are stable, even if the legs are all different sizes[1].
[1] Three points make a plane, the plane itself may not be level, but because all points of contact are on the same plane there is no wobble. When there are more than 3 legs, some points may not be on the same plane, producing a wobble.