have you actualy riden one or are you speculating purely on pictures you've seen? the wheels are meant to offer more grip, smooth out the ride and take some of the shock and discomfort out of hitting stuff you shouldn't, surely that increased performance will give more control to the rider? the weight difference is marginal, but it's probably negated by the benefits of more wheel increasing efficiency.
there was a point when disk brakes were being debated, and people didn't think they'd catch on. now you wouldn't humour an MTB without them. same goes for suspension, that was criticised for being heavy, expensive and unecessary, but you probably except that a full susser will thrash a hardtail down most descents...
i've been flogging bikes at halfords for 3 years, most customers love the hybrids with 700C wheels and mtb tyres, because they're more efficient, you are in a wierd snobby little niche, wanting smaller wheels that require more effort to acheive the same thing, with less comfort, just because thats the way it's always been. would you want an old T-VEE with 20" rear wheel, rear freewheel and vee brakes because they were the norm? or would you prefer front freewheel, a 19" wheel and a modern brake set up?