Re: Why is this a bad idea?
Sorry, I missed the folding ones. I actually went back through and still didn't see them.
To answer something else that came up: I did snorkel off of my C-25 ladder a few times. I used fins with booties and put the fins and mask around one arm as I went down the ladder. Put on the fins and mask in the water. To climb out I did the reverse and tossed the gear into the cockpit before climbing in. The booties make the C-25 stairs less annoying.
This would be a lot harder with scuba, but not so bad if your dive buddy got in the water first with no gear, you passed gear down, and then got into the water and put it on. A pain compared to a dive boat, but not that bad.
The other style of ladder that I showed would make it a lot easier since you don't need to haul stuff up and over the stern pulpit. The ladder on my Pearson is also much wider than the C-25 ladder (I'd guess another 6").
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior