Stern design and safety in following seas

Ahoi shipmates.
I've always wondered about some boats i see cruising along the east coast which have ginormous swim platforms attached and how they would be affected by a following sea?
A boat I've recently asked about in a different forum thread is a 50ft Halvorson displacement pilothouse trawler that has a rounded stern which has had a swim platform attached. Isn't the design thought behind a rounded stern on a displacement cruiser to improve or lessen the effects placed on the boat in a large following sea? I've attached some photos for a look see. Any thoughts?

Pure spit-balling zero credibility guess:

Me-thinks it wouldn't be an issue 97% of the time, but if conditions are bad enough that waves start using the swim step to push the vessel off its intended course, you'd wish it wasn't there.

MurrayM said:

Pure spit-balling zero credibility guess:

Me-thinks it wouldn't be an issue 97% of the time, but if conditions are bad enough that waves start using the swim step to push the vessel off its intended course, you'd wish it wasn't there.

Click to expand...

Yeah in perfect conditions not a problem. Can't understand why you would do it if you have in mind blue water or coastal cruising where you may encounter large following seas especially since you're in a 8-9 knot max displacement cruiser.

Some water will go through the slots on the platform, reducing force. An overly long platform is more likely to hit the water and get pushed on. But if it's up high enough and not too long, it's unlikely to be an issue. The water should just be pushing on the hull below the platform.

The home port may suggest she's only sailed in Sydney harbour.

rslifkin said:

Some water will go through the slots on the platform, reducing force. An overly long platform is more likely to hit the water and get pushed on. But if it's up high enough and not too long, it's unlikely to be an issue. The water should just be pushing on the hull below the platform.

Click to expand...

Pictures would suggest that the platform is probably only about 1 ft or less above water line observed from waterline paint stripes?