Since you asked, my (probably unpopular) opinion is that the only "true tool watch[es]" for sale to civilians today are made by Garmin, Polar, Suunto, and Coros and are used by professional or serious amateur runners, triathletes, hikers, etc. Those are the folks that actually need a watch for their profession or preferred activities.
The original Legend Diver was certainly a true dive watch. Today most professional and recreational divers are going to use a dive computer; however, the modern Legend Diver is ISO certified, so it could fill that role or serve as a backup. But I suspect you're extremely unlikely to find one anywhere near its 300m depth rating.
As to whether or not the watch is suitable for daily wear, I see no reason to believe it is not. Certainly, shiny, polished surfaces are vulnerable to visible scratches, but that's just character.
If you want to use it as a backup to your dive computer, you have to set the inner bezel while you're on the boat. Kind of annoying. A tool is supposed to make your life easier, not harder.
I never got over the sapphire crystal. Decent watch but I sold mine years ago.
I consider my GSAR a tool and used it as such. Pretty basic in the feature department, built to a standard for a specific tool. I think Scurfa's watches are tools. Sure, they come in many colors which allows him to sell to many different people and keep a viable business operating. He's a diver himself and has stayed pretty true to his original concept.