I am plenty happy with my attatched foot main and mizzen. I feel that the bolt rope at the foot of the sail distributes load far more fairly than points at the tack and clew, with less reinforcing needed at these two connections. The complaint regarding outhaul adjustment does make sense, the extra friction due to the boltrope is certainly a hinderance to tightening, yet this is not a problem I can remember encountering. I feel that my attached foot sails have better shape insofar as their draft, they also make a great hammock when running from the wind!
Sailing a '74 Challenger 40' Ketch rig out of San Francisco