I don't relish all of the issues which will eventually surface with SpaceX's Starship, which makes Space Shuttle development look like a paragon of high quality development practices. Starship is built in a metaphorical barn with a "fuck around and find out" attitude.
I don't think that's quite the case. SpaceX's method is more "release early, release often", and find (and solve!) issues early on. Traditional space companies on the other hand use a very rigid waterfall method.
SpaceX's method is not "fuck around and find out". It's design, find out, iterate. From what I can tell from the outside, it seems very reasonable.
If you're looking for a rocket company with a barn and a "fuck around and find out" attitude, Pythom is the one. Watch how they test rockets: https://vimeo.com/690376951