Yes, it's informative because a very simple reason - the 486 especially Intel's did have the CPUID feature but they showed the registers values only on reset - that's why BIOS can figure out the CPU but software is not so precise.
Very smart decision.
I hope the popularity of this family will increase.
P.S. can you tell, whether CPU-Z is able to recognize any of your 486? I see you have ones from Intel, AMD and Cyrix. If yes, a picture of CPU-Z would be nice