I'll leave out the production reasons for VF designs. It's usually merchandising, need to be creative, or something involving LEGOs.
As for in-universe stuff, the VF-0, VF-9, VF-22, VF-5000, VF-3000 also had the frontal cockpit. So it's not just the VF-1 or the VF-11.
The VF-1's leg design is somewhat dangerous. The fact that the leg can separate from the fighter is somewhat hazardous. True, as the hydraulic is passing the leg to the hip joint, it is always connected. But if the hip joint fails to connect, there's a problem. If the hydraulic connector releases the leg too early, there goes your leg/engine.