Yep Humble Mechanic is a good youtube channel to check out if you'd like to hear a bit about the behind the scenes at the dealership, he's a former VW master mechanic for a couple dealerships in the US@BigHeadClan,
That makes sense. I was told by my service advisor once who I had a pretty good relationship with that the techs were paid less for warranty work and so they weren't crazy about performing it. At the time I got the impression it was like a lower rate, but it makes sense that they'd set time limits for it.
and it's actually pretty sad to hear how their technicians are treated sometimes.