I have a Brother that embroiders. The embroidering unit has its own computer and attaches onto the machine, also holds the hoops. If I cut a hole in my sewing table so that my machine sewing surface were level with the top of the table I would not be able to attach the embroider unit. Likewise, I would not be able to disengage the part that lets me have a free arm for that type of sewing. Basically I would drastically limit what my machine could do if I cut a hole in the table and sank the machine down a few inches, and I paid a few thousand dollars to have this machine and all it could do.