Tell that to everyone who's been running aftermarket rocker arms without any fancy geometry correction kits with zero problems. Sorry - not buying it! Actual empirical data would be useful for your argument. Anecdotal **** doesn't cut it. We need numbers.
The best I can offer is a fellow FABO member near me used a kit from B3 and his 1/4 mile ET dropped by a tenth and change. He told me it was worth my time to contact him for the kit.