TV is exactly that - 'a spectator sport'. Well spotted !
You sit, you listen, you watch and -sometimes you can learn something !
Sewing. in terms of creativity and teaching, is no different from the unending and seductive pull of cookery programmes and any series about DIY, pottery, painting and sketching, gardening, keep fit, sport, horse-racing, farming, driving, renovation, restoration, antique collecting, bird-watching, diving, silversmithing.....you name it.
If it's on t.v. you are naturally spectating and if you're interested, you watch, you learn and you're entertained. If not, your choice and you go off and do something else! Maybe it's the whole principle of t.v. that's being criticised here.
12 clever people choosing some fabric and quickly turning it into something to wear? If I couldn't thread a needle, I'd still be fascinated by the process. And fortunately, so would thousands of other lively-minded souls.