The Dogma rules shouldn't be taken as arrogant. They are only really meant to be a bit of fun.
Lars Van Trier departs from them all the time.
They are a useful way of making films that don't cost a lot of money that is all.
They respect the actors as a central part of the creative process, do away with a lot of the superfluous techniques that are used to distrcat the viewer such as sound design, remove the need to use expensive equipment by having everything handheld.
Some of the films made under the Dogma rules have been breathtakingly good.
As ever in the film world, take what you want and leave the rest. Nothing is set in stone.
I'd like to have a go one day as Lars is one of my favourite directors and Andrea Arnolds Red Road is one of the most thought provoking films I have seen in a long time.