Personally I think its fine to utilize Sneak with other trees. If someone is willing to put forth the memory slots then they should be able to use the skill. Just like Guard Breaker and Iron Guard, I can use them without loading up Kungfu or Aikido.
However, by NOT loading Spy Style, they are crippling themselves to an extent by not being privvy to the stealth buffs that SS gives its user. It's much easier to pop them out of sneak and see them as a result. The same applies to any move that "prefers" a certain style.
By setting a style preference the ability can be enhanced or it can just be plain, but the choice is clearly up to the user.
You knwo I don't care if it goes this or that way but I am still one that does not like mixing sneak with other trees except Spy, because it just doesn't make any scens.
Laters
If anyone wants to load sneak with their build, then they're entitled to do so. I do struggle to see the point on occasion though. MA's wasting nine points of memory just to hide in pvp, comes to mind.
You knwo I don't care if it goes this or that way but I am still one that does not like mixing sneak with other trees except Spy, because it just doesn't make any scens. Laters