Nonsense.
Scopes can be too long for mounting on short actions to achieve comfortable eye relief. I am glad that manufacturers are offering this.
I guess I'm a contrarian too.
They "could", but which scopes are too long for comfortable eye relief on a short action rifle? I mount some big, long bastards and have never noticed any discomfort or problems mounting for optimal eye relief...
Then again I don't care about weight of a scope AT ALL either. I like my comp rifles HEAVY, and a few ounces isn't even noticeable.
There are a lot of applications where a longer eye relief is necessary (up to scout style), but short action, low recoil rifles aren't on my list. I don't even mind a sub 3" relief on a 6mm/6.5mm with the recoil of a .223. I can put my eye right up to it and free recoil all day long without it biting me.
The traditional teaching is to mount it so when you take the rifle up naturally, put your cheek to it, and open your eye you are on the correct distance for eye relief and have a clean sight picture. Great, for a hunting rifle, or F-class, or other sport where you are on it the same way every time.
IMO, for positional shooting, it's best to set it up so your cheek weld will be on the forward portion of the cheek rest so that the front part of your cheek is slightly off the front of it. This allows you to always be in the same place by feel without having to think about it or shift forward or backward to get your eye into the proper position. You're not going to get on the rifle the say way every time in positional shooting, so the traditional method doesn't make sense. If you're in the middle of your cheek rest all you have to go on is your sight picture in the scope; so you'll be shifting back and forth trying to find it if you're in a goofy position. If it is anchored to something you can feel on the cheek rest you can find it without looking through the scope even when you're underneath a truck with the rifle stuck through the ball bracket and your head twisted sideways to fit between the bed of the truck and your scope.
Because of this, and it may just be me and the way I do it, I don't want a ton of eye relief so I have to set the scope further forward. 3"-3.5" is about perfect, where I want to be, and more isn't actually helpful.