Just my .02 Cents but.....I don't really care for the Plastic sheath on my 3-MIL. To me it feels cheap, and the knife has some wobble when inside of it. I like the function, and design of it, just not the material. I definetly prefer Kydex, and plan to get one for my 3-MIL.
AS far as the HEST having the Storage in the handle,and possibly the LS. I don't see a problem with this either way. I Have not put the space to use on my HEST, but it doesn't mean I won't. And I don't think if the LS does end up with this,there should be any issues with strength, and I think it can't hurt to have some extra space for a rod, cash, or whatever.