Federal Regs/Laws and Consumer Demand has resulted in vehicles with more and more advanced systems that push the edge of performance and engineering. Because of that, the demands on the fluid are higher than ever before. and the equipment will NOT survive using past fluids.
Chrysler is NOT the only manufacturer that specify newer, more specific, harder to find fluids.
Anti-Freeze is because of owners that never changed the anti-freeze in their vehicles and when they damaged the cooling system of their vehicles because of it, they blamed the manufacturers. That is why there is dozen new long life anti-freezes, when the old green is just fine, if people would just use it correctly.
Plugs, true, as long as you have the right type with the temp range, they should work just as fine. But people have experienced problems using anything but the specific OEM plug. Others have no problems at all.
You need to figure out the ignition scheme of your engine. Some engines that have the wasted spark system, usually have half the plugs on reverse current. If you reverse current on a spark plug, you reverse anode/cathode, on a single platinum plug, it will erode away even faster than a normal steel electrode plug. You need to use double platinum.
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