I have a Viking suit with an attached hood and it's the only drysuit that I have ever used. Personally, I love the attached hood - it's lightweight and keeps me dry for the most part (especially when I use a ffm). It takes a little getting used to, but I was sooo glad to get rid of my heavy wet suit hood. I don't find that the hood restricts my head movement, actually I find it easier and less restrictive and I can hear people topside without taking my hood off.
It's also nice to be able to slide it back between dives and not be choked or have to pull it off entirely like I had to do with my wet hood.
I know it's a personal preference for some people, but all the divers I dive with have not cut theirs off (though one will use a neoprene hood sometimes b/c he gets cold easily - he just slides back the latex hood and uses a neo drysuit hood with no bib).