I have never used a level to set any of my woodworking machines either level or plumb. In my opinion, all that matters is the relationship with the cutter or bit to the supporting surface which can be checked with a square or dial indicator. In the case of my drill presses, all 4 of them, the table is factory set square with the quill by either a moveable pin in a pre-drilled locating hole OR by the machined surface on a fixed table. There are no "user" adjustments for fine adjustments other than the coarsely graduated degree half circle provided. Nor do I go around with a level and shim the bases to thwe bench top or the floor to get them level, as they are sometimes moved about.
My milling machine is not adjustable for table to column adjustments either. All that matters is the relationship between the quill and the table which is established with a dial indicator and"tramming" the table back and forth with the work piece held in a vise or clamped to the table.
My table saw may or may not be level, I have no idea? All that matters is the relationship of the blade to table surface which can be determined by a digital angle cube or a draftsman's triangle. The blade should be and is set at 90 degrees to the table surface for all my cuts except bevels, which I rarely do.
In industry, where there are huge multiple machines ganged together, like the printing industry (Hi Frank) having them level is paramount. In the auto industry, where I worked, level and plumb was also of primary importance. The clay models I worked on where self locating on one side on ball shaped center pods. Each time a model was moved out of the studio to the viewing area it had to be first scribed with cross hairs and in and out measurements so when it was brought back, it would be in the exact same position. Engineering would precisely scan the surfaces to translate them into digital data for CAD drawings. Accuracy and precision was THE name of the game.
Woodworking is precise for certain, but not to the tolerances of other industries.