There are many reasons, but the main reason is weaker steel in the older firearms. Please do not shoot Leverevolution ammo "in any lever action". The Remington and Winchester loads are light for a reason--safety. Please refer to a reloading manual, the manual will discuss which loads are safe in which firearms.
The Levervolution shells were designed for the lever action Marlin rifles. The tip was designed so they would work in a tubular magazine without setting the on in front of it off. The .45/70 shells are loaded light because of the older guns but in the modern lever action rifles they are completely safe. I shoot the .450 Marlin because I wanted something different and didn't want to have to reload. I have a Marlin 336 made over 50 years ago and I shoot the levervolution shells in it all the time with no problems. The problem comes if people try to shoot a hot loaded .45/70 in a gun designed for blackpowder.