I think Razorclaws are Mirelurks, at least they behave similar as them from Fallout days.
If you want to mute into crabmeat - there is a mod for it ( Crabcakes )
Personally, I’m very thankful I don’t run into those brute-sized-tanks more often, and when I do - they do the dirty business for me around the city… with right guidance and incentive. Obviously, that part of the city is no longer open for visitors after that.
I’d rank Razorclaw shipwrecks same as Fallen Office Towers as far as danger goes.
As for them inheriting the planet - acid slugs would do that… or, as you said, the roaches.
Why is there a butt with pockets in title?