In the old days pilots had a small light with optional red filter. I suppose that is why the popular notion of pilot flashlights having a red filter... because that was the only choice. These days they have a choice.
I have found I see better with a dim blue than dim red. Also it seems I can be more stealth with blue because I can see more with less output, thereby less likely to give away my position at a distance with a dimmer light.
Green? Some prefer that as their filter for various reasons. Some say it works better for them than red or blue. Yeah, I can understand that.
Why did Mag do colored lights that only have that one color? Perhaps the same reason they did incan ML25's when the LED versions came out. A niche market nobody else had tapped into.
Big seller? Probably not, but to the person who wants a flashlight that only puts out a green beam Maglites minimag has a good reputation at being a reliable, US built flashlight for a big box store price.
I speculate the sales of the incan ML25 in 2016 played a role in their decision to put out warm LED lights in their popular, small flashlights. They did a white LED ML25 and a warm tint incan. Perhaps it led them to think perhaps the consumer market is wanting the classic Maglite era incan tint with a more modern output. That puts them in a class by themselves all by themselves, at least for now...
Warm tinted consumer marketed flashlights, not to be confused with the hobby marketed like those popular here at CPF.
Who knows? Maybe it'll open doors for the hobby marketed lights to enter....