My guess is that they are due to movies like Mad Max. Names like Warrior, Avenger, etc., give folks a sense that these RVs will hold up through a nuclear war, etc. That they're tough and can survive anything. That's why toy haulers most often have these names - because you have tough toys and want something tough to carry it.
The graphics are a compromise. Most guys would probably prefer their tough RVs to LOOK like something from Mad Max (like it went through a nuclear war), but women won't go near something like that. So they use the graphics to try and evoke the emotions.
The interior lighting is just due to all those design shows. Old fashioned ceiling lights and lamps are out of style and dated. The style now is to use task and mood lighting. It will change back in a few generations like everything else.
It's all more prevalent now because marketing has become extremely effective in the last 30 years. For whatever reason, more and more people (of all ages) are more susceptible to marketing than ever before. To the point that they don't even know they're being marketed.
