I understand that when NorthWest were planning a redesign of their logo and paint job, it was done to reduce costs. The v.stab simply has less paint on it! Some of the new carriers think up the most ridiculous designs that are intricate and, therefore, costly.
The current fashion is the wavy line, after decades of straight cheat lines. These take longer to get right, so I am waiting for the tide to turn and people to stop using them. I admit bias here ... I hate wavy lines on a/c. It just looks wrong, wrong, wrong.
Incidentally, the weight and quality of paint was an issue for Concorde, especially as the stuff had to be able to go from sub-zero temps in the sub-sonic phase and then boiling point (or something) at super-sonic.