So that leaves it up to the end user, to equip with hand holds etc to meet "THERE" needs. Frankly, I personally would rather set up for where I want to grab on to, vs where they think I should reach to! Give me a well built production model that is able to prep my way, vs a well built boat ready, that is NOT the way I want any day of the week!
I think Marty is on the right track here. You need to modify the boat to meet your needs.
However, keeping the modifications you might want and the feasibility of making them in mind as you select your dream boat is important. Example: overhead rails -- I don't have them on Billy Ruff'n because I haven't figured out how to modify the cabin top structure to make them really secure. (And, I do have adequate waist-level gripping points for moving about the main cabin, so I haven't really felt the need to redesign the cabin ceiling.)
Unfortunately, most of us (me included) buy the boat that we will use offshore before we have substantial offshore experience. We tend to trust the builders to equip their boats with what's necessary for safe passagemaking. Marty's right in his observation that builders design for the market segement they're targeting. Aftermarket buyers with intentions for their boat that may be different from sailors in the builder's target segment need to know that the shouldn't necesarily trust the builder to put into the boat all that they will require to be safe at sea.