COULD A PONTOON BOAT LIKE THE PREMIER, WITH 3 PONTOONS BE CAPABLE OF HANDLING SAFELY IN 4 FOOT OCEAN SEAS?
What are those seas like? Long-period swells (a dinghy could handle those) or close, steep close together whitecaps? So the most accurate answer is " it depends."
Now, were you to ask if pontoon boat was a recommended type for offshore work, we would say no.
Yes, if it's a Beachcat 23, fiberglass one piece catamaran hull rated for 4 ft. chop. I own one and have taken it out in 4 ft. chop with no problems. If you keep the speed up, the air cushion effect smoothes out the bumps.