Hi Martin,
I can see what your getting at here, the baseboard would need to be very flat, in fact it may not be able to get a baseboard flat enough. If it is, then yes it certainly opens up the cutting size options. It even makes much bigger and quite cheap 3 mm MDF made trackwork variable.
what was not covered in the review was any comment on a protective cover, which I am finding both for stray light and controlling the smoke/fumes, a must have feature.
It will be interesting to follow the development of this concept. As it could have some unique advantages.
phil.