That sounds more efficient to me? Same as processor heatsinks.Some other deisngs have finned pipes with a slot over metal cover, that can't be efficient.
Thermaskirt is just pipes run around a room with a cover on, you still face the problem of what do you do when it gets to a doorway.
I can see the advantages in big rooms in that you don't want to be falling over radiators, but in small rooms a panel radiator under the window does a good enough job of heating a room and the modern flat ones look OK.
Had a chuckle the other day, instead on buying a towel radiator, this guy had just made a few teed-off sections of hot water pipe and hung his towel on that
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