I don't get the issue with color. If its concealed, what difference does the color make? You can't see it. When it comes out in defense, I'm a firm believer it comes out only when ready to be used rather than as intimidation. For me, that could be black, some military solid or camo combo, or any bright and flashy color/combo. It simply doesn't matter as the sights are what I'll see and the muzzle is what the other guy should be concerned about.
If one look is more attractive, for whatever reason, go for it. I've bought 1911's partly for their fit/finish over less expensive options. I've bought old S&W revolvers for their finish compared to new manufacture. I've also built my ARs to fit a look as quite honestly most everyone makes functional parts these days.
If a new shooter has interest in shooting due to a given look, great. I think some people get hung up that an "uniformed shooter" will buy based on looks rather than function and these guns that aren't black/military based/stainless steel are doing those shooters a disservice is a misconception. If you're buying based only on looks, having a pink option is no different than picking the one you think looks cooler between two black options. Its still going to be a sale based on image rather than substance.
And let's not all act like our first purchase was the most informed one we ever made. I remember wanting to buy a crate full of mosins for some reason, among a few others. The beauty of getting any firearm into the hands of a new shooter is that after a little time and practice, that knowledge of what would be better and what works well is gained and a well informed second purchase can be made. Everyone guesses to some degree when they buy their first anything. If a colorful firearm gets a new person shooting, and potentially gives them the experience to know what to look for in a second purchase. I can't complain.
And let's all not forget, manufacturers make guns to fit the market. If a market sustains colorful firearms and you don't approve, it just shows how out of touch you've become with the buying public. I learned a lesson a long time ago when it comes to sales on a large scale. Provide what others want, not what you want. If the buying public wants a pink gun, I'd make a pink gun with no regrets.