I have to agree with
@ams511 on this one. ScubaPro regs are a serious choice for any serious diver. Using proprietary fittings that require special tools is a chump move. I believe ScubaPro hoses to be of extremely high quality. But, for my 4 new SP regs, I will not be using any SP hoses. If I'm on a boat somewhere and have a sudden need to take a hose off (or tighten it), I am not going to be in the position of having to find a special tool, or remember to bring one with me.
Expedition-worthy gear should be designed to maximize ease of dealing with unexpected situations in remote locations. Splined hoses that require a special tool is the opposite of that. It is not justified at all by saying that they are trying to stop incompetents from working on their own gear. If SP gear is going to have design compromises to accommodate idiots, then it would be hard to continue to take them seriously as pro-grade gear. Plus, honestly, I think unqualified people are more like to mess up their gear by doing something like using a pair of pliers on a splined hose than if you just gave them a hose with a normal nut on the end.