These arguments are silly. Don't like it, don't use one. My boat is leaps and bounds faster than anyone else's in my club. Do they restrict me? No.
I've been with kayak fishing since the start of the boom. Some guys I know have been with it much longer, like decades longer. As more people use them, and builders get input, the fishing kayak will evolve. I see them as personal fishing crafts. I don't make any distinction of whether it's SINK, SOT, hybrid, pack canoe, or what ever, unless I'm trying to describe it to a layperson. If you rig it to fish, be that a bungee fire one rod and a small pack of lures on a lanyard, or full blown fishing battleship with electronics and a dozen rods, then to me it's a fishing kayak.
Hobie makes a quality boat, quality that goes way beyond the Mirage Drive. They've sweated all the details, and that comes at a premium. Wilderness Systems, Ocean Kayak, Feel Free, Malibu, Jackson, and many others are building just as elaborately and thought out rigs that don't use Mirage Drive type of propulsion, for you purists.
Looking to the future, mark my words. In our lifetime we will see the whole landscape of personal fishing craft change, both in terms of hull design and sheer speed, as the price and efficiency of lithium powered propulsion comes down. "Green" boats are coming.