The cut in that video would have sounded better and smoked less if the "builder" (I use the term lightly) had
Used air to clear chips
Added a regular squirt of WD40 or similar
Used a decent spindle clamp

As daft as it sounds, adding mass to the spindle mount wouldn't hurt, as a general rule of thumb you can never have too much mass or rigidity in a machining system, especially in areas subject to vibration.