I think we are all digging a bit deep here, so let me give you my perspective.
This is a simple comparison, no bashing, just a well-known company to make an example of
Let's take Poorboy's. On a light cut level, they have:
-SSR1
-Pro Polish
-PwC
-PwC Blue
-PwS
Think about this for a second. Five polishes on their line that cut below a 2 out of 10. You could argue that you use SSR1 for any use, PP for more chemical cleaning action, PWC (blue) for carnauba topping, and PwS for sealant topping *generally speaking*. However, let's get back to basics. Menzerna (for as long as I can remember) marketed a polish for heavy cutting (Powergloss), medium cutting (IP), and light polishing (FPII) to the US markets. They never added in a wax or sealant or chemical cleaner, just good old-fashioned, precious abrasives mixed with their concoction of lubricating oils.
Now, I don't think it's much of a secret that Terry at CMA now has a licensing agreement with Menzerna USA which has an agreement with their German headquarters. If you rewind a couple of years to when Menzerna had their plain-jane cylinder shaped quarts and pints (think PO85RD and PO106FF), you will see how the company has evolved to fit the consumer/boutique market. Everything is now available in pints with flashier labeling and a broader product line.
Last month, Proper Auto Care introduced "Menzerna's One-Step, Acrylic Jacket" which they said "If you're an existing Menzerna customer, think of this product as 40% Final Polish II and 60% FMJ sealant." Anyone who has been around for a while and has began to poke around about the similarities in car care products can probably concur that what Proper said is probably as close to the truth as it gets.
So, why did they say that the new Blackfire Scratch Resistant Clear Finishing Polish shouldn't be used on vehicles pre-2005? Well, let's see, money. This business is all about profits. If you knew the background about how much the actual core product costs, you'd spit your [insert drink here] all over the screen as you read it. The markup in detailing is huge and since its all relative on the "boutique" level, they can and will charge it. Joe Consumer may just buy their standard finishing polish, but if he picks up a new car, then chances are, he will try out their Scratch Resistant Clear Finishing Polish. And, like many other people here, he will sit their and try to discern minute optical differences in hopes for that little extra shine and ultimately have a lighter pocket for it.
Proper is simply following the rest of the trends in the business. They realize that people itch to try new products. How many of us out there have just pulled that trigger because they heard enough hype to justify their purchase? I'm guilty as charged, too. But, if they have many similar products (read: Poorboy's) and a reputation for a good-product base, people will buy. Plain and simple.