in theory it is relevant, just if you ever have to put it into practice........ another story
when you have an issue with your Car or Van, you want to be able to take it to the dealer and know you will be looked after good, as you spent a big chunk of change on their product
however, despite what they say, most dealers & Manufactures dont want to know about problems or fixing them
it costs them time and effort
that, and - how dare you say their product is not up to scratch