Actually, you can teleport with the non-aether generators, you just pull from the capacitors instead of directly from the power supply, and they take longer to recharge.
What it comes down to, though, Fred, is that what you're talking about is exactly what the MCAS is meant for. It's the exception. It's just a good way to make the exceptions a bit cleaner and easier to work with, rather than making a million little articles for each and every modified version of armors out there, and it establishes a good, simple template for all of them to use. Nobody here, save possibly for Wes, is advocating the MCAS as something you should be seeing regularly. It's for that 1% of the military that can't use standard armors, or who have earned the right to their own custom unit, and even among those numbers, probably only a third would actually HAVE an MCAS when it comes down to it, since most of them aren't infantry, and wouldn't need the system as a result. When we're down to talking about 3 people in 1000 who would have it, it IS the exception.