I think it is pretty easy to determine there are more available Rigs than one person can ever take the time to fully audition.
For a start:
At the moment, there are approximately 17,371 free Rigs on the Rig Exchange.
If someone spends just five minutes auditioning each Rig, it would take 86,855 minutes.
That is approximately 1,447 hours and 35 minutes.
With an hour a day, 365 days per year to audition Rigs, it would take 3.96 years to audition all the free Rigs that are there today.
Of course, during the next four years, many, many more Rigs will be added to the Rig Exchange. So, it would not be done at that point
And, there are all The Kemper Factory Rigs.
And, all the Kemper Rig Packs.
And, that is not even mentioning the thousands of available Commercial Rigs.
So..... I think there is a point where the PAS Rabbit Hole could get in the way of actually making music for some people.
My suggestion is this:
Find some Rigs for the specific amps you need for the music you want to make with them. Doing that will give you a Standard that all other Rigs will have to match. After you have done that, it will be much easier to quickly know if other Rigs will potentially be of any use, or not.