It isn't an issue of christmas tree ladders being bad, it is an issue of poorly designed ladders being poorly designed. This is a photo of my christmas tree ladder on my other boat. If you notice, it has two sections, one under the water and the other coming a full six feet out of the water. You are on the platform while still on the ladder climbing. There is always a rung in your hands.
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Here is a deployed photo from my old dive boat, similar designed ladder, just less refined. Still very easy to climb and board.
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I am still changing things trying to make life easier. I went from a good ladder to a better ladder, to an elevator.
My wife is a 5' technical diver and for the last two years, half of my tech students and charter customers have been female. I try to design and accommodate where possible.