There is no snobbery or elitism, a handbuilt wheel by someone who knows what they are doing is going to be better, they will get the wheels properly tensioned and trued and dished and everything, the machines can make some decent wheels but it won't beat a good hand and knowledge.

In terms of wheels they are a system and when parts of the system aren't in the same realm as other parts of the system it won't work as well. I could throw some DT Swiss Alpine III spokes on it but if the hub isn't strong and the rim isn't strong it won't help. That is where an experienced wheel builder can help make choices to give you a stout wheel that won't need much of anything in its life.

For this wheel it has failed but it should be covered under warranty assuming Jenson is a legit and is going to help you which they should. In the future buy from your local shop and that way you can go right in and have them file a warranty rather than having to go through emails and a website and potentially more because Jenson won't be able to assess your issues with the bike in a stand. So they might ask you to go to your local shop have them assess and go back and forth and back and forth. However in this instance that will be the case.

I will say this getting work done at another shop is generally not something I will cover. Maybe Jenson is going to be different since they are online but I don't generally cover work done at other shops unless you have called me in advance and explained the situation and it is some extraneous circumstance. That other shop is likely to go "oh yeah they screwed it big time and you need x, x, x, x, and x, why would you go there blah blah blah". We actually had that semi recently and it was unfortunate because it was a simple warranty issue that I would have happily gotten the manufacturer to cover however they brought it to another shop and they charged this customer to purchase a bunch of new parts and all the labor associated with it.