I have not used polymer products on boats or cars yet, but they are becoming accepted and used on cars. I think these guys are taking that car detailing process and putting it into yachts and packaging like the Griot Garage car guy did and made millions. I am not sure if gelcoat and clear coats have the same characteristic chemical makeups and if this will work. I would probably wait a bit myself to see how this evolves. I am not a pioneer of processes. A chickenshit actually.
As far as what these guys are selling, I recognize the dual action polisher as something you can get from Harbor Freight for $70--I have one (and also a more expensive Porter Cable model and a professional Makita polisher. I have been working on boats for 30+ years and I like the smaller dual action (DA) units by Porter Cable and Harbor Freight over the heavy Makita. I used to use 3M wool buffing pads on a Makita and multiple grades of polish before the final waxes, but I have evolved to using foam pads (available at Harbor Frieght but the 3M are much better) much like the one he showed (which appears to be wax pad--the polish pads are different--3M now makes them as well). I hire talented folks for prep work now. I can slap on the wax and keep up with it once the base work is done. My guess is that there is nothing stunningly different about their polymer from the car care type--they do not represent themselves as chemists.
These guys are skipping over the polishing process that you do not like (Who does?) and that is convenient but you have to wonder.. I am going to guess that you could slap on some wax or polymer and your boat will look instantly better for a short period, but the UV damage to gelcoat is really deep (Awlgrip is another story) and I wonder about polymer coating on gelcoat vs clearcoat -- this is a chemical bonding process and I am not sure how similar they are. I paid a guy $1600 to polish my recently purchased and neglected Ericson 32-200--this was polishing everything and I thought it was fair. He spent 12 -8 hour days, mostly with progressively fine polishing and waxing. I am getting too old for this. But I have kept it up easily with slapping on coats of Fleetwax in 2 hour sessions covering maybe a quarter of the boat at a time a year later. The boat looks new. My view is the real work is prep. Waxing is nothing. I guess the question is whether the prep is necessary. I might be wrong, but I am an experienced varnish guy and I know that most folks skip the proper prep and pay for it with endless rework or awful looking results after a year or two. Well prepped and applied varnish will last a long time. Slapped on varnish looks like hell shortly. They sell a lot of varnish substitutes that look good--for a short period.
The first versions of these polymer coats on cars were a mess: peeling and flaking and no easy way to remove them--but I think that has been resolved because all the major car care companies are offering polymers now--I think they have improved them. But I have not seen a polymer product offered by 3M yet--and they are the go to for professional detailers and many upscale boat yards, like the one I work in seasonally. So I wonder. I am not putting polymers on my car just yet.
Lots of text here for not much substance. But that is my experience. Mainesail is a bit overboard on most everything imho (I really feel sorry for his recent situation) but I give him credit for being directionally correct on most issues. My point is, prep matters, and it is hard work with gel coat because it is porous stuff to polish and fill.