To make a point, that in reality complaining lepers are just trying to get more than promised.
Then you are making a point the actual customers who bought the LEP shouldn't be making, and I'm not sure that anyone actually is.
It is confusing, partly because it was so long ago now, partly because it wasn't entirely obvious to those that bought it what was actually being sold. The description was very much open-ended and ambiguous, and that forms part of the frustration.
The LEP entitles the customer to all future premium updates at no extra cost, nothing else. By way of an apology for the delay at the end of last year LEPers were given some free cosmetics, which I believe are not exclusive. The Horizons pre-order stuff (and Horizons Beta access) were included in the LEP because of the timing of the orders. I had the choice between paying for just the Horizons beta pack, Just Horizons or the Lifetime Expansion Pass. For all three options I was entitled to a £10 discount because I already owned the base game, I don't remember the exact details but the base game was included in all three options but already owning the base game (which I bought for £39.99 in January 2015) made a difference, possibly that was what got me the Cobra MkIV or the Gold AspX, I don't remember.
It certainly would be nice if someone from FDev could helpfully contribute by clarifying this stuff.