Completely understand, I’m glad to hear you had a good experience! The process you described is exactly how the warranty is supposed to work. The fact that you went through an Roush authorized Ford dealer who clearly has a good working relationship with Roush is probably what makes all the difference.
From your description it sounds like your concerns were pretty straightforward. The issue issues I’ve seen typically stem from the dealer not understanding the difference between Ford and Roush warranty. The dealer starts throwing parts at it billed under Ford warranty since it’s easier than going through Roush, only to find out weeks later that they issue is related to the aftermarket modifications, and Roush should have been involved in the first place. So now you have a customer who is upset that their car is still in the shop, they’re blaming Ford (a lot of ppl don’t understand that Roush/Shelby modified vehicles aren’t built by Ford), the dealer has thousands of dollars in repairs that aren’t warrantable, and Roush wants nothing to do with it because the vehicle has been disassembled multiple times with multiple repair attempts. Definitely a dealer originated issue, but it becomes a mess for all parties involved, especially the customer.