At this point in the hobby, I'm not sure that has to count as paranoia. I myself test all incoming reptiles for the relevant pathogens per their species. It is an interesting question whether it would make sense for all keepers to test, though I do think that all breeders should be testing (and doing a lot of other things to maintain clean captive populations that many are not currently doing).
There is some good info out there.
https://podcasts.apple.com/us/podcas...=1000500974355
https://podcasts.apple.com/us/podcas...=1000559028288
Longitudinal and Cross-Sectional Sampling of Serpentovirus (Nidovirus) Infection in Captive Snakes Reveals High Prevalence, Persistent Infection, and Increased Mortality in Pythons and Divergent Serpentovirus Infection in Boas and Colubrids
Nidoviruses in Reptiles: A Review