They are quite well seasoned. But it’s also worth noting they are developers as well because the job usually has you debugging things or writing code that needs to be run for the specific customer. Not a large amount of code, but just things that end up being specific to a customer.
And if they have to come to a developer that actually works on the product, it’s usually a pain to try and figure out what is going on. Thankfully, this is very uncommon.