Aren't most plastics white or yellow by default? Making them other colors requires adding dye. Clear might be an option but it might be a little uncanny valley style morbid to see their parts moving around under their "skin".
I read recently that white plastic was the more expensive color to produce. I wanted to cite/link a source but internet search is frustratingly bad these days.
I remember seeing someone talking about pipes and recommending white pipes for hot water, because you can't recycle plastic into white color and recycled plastic had less thermal resistance (isn't that white pipes had more thermal resistance, but that white pipes are probably not recycled).
That's a regulated thing already, you can't just decide to use one color or another, pluming regulations have designated use for black pipe, blue pipe, white pipe, that I'm aware of, but I couldn't say exactly, I only sold the stuff, I just know when a contractor says ''I need [color] [material] [size]'' there's no alternative pipe they can use.
I don't think so, but from a consumer point of view, white appliances and wood panel appliances were the industry standards for kitchen and laundry vs home electronics like TVs and radios, in the US a white appliance is usually more expensive but more reliable than a wood paneled appliance, but people also see chrome and black appliances of all kinds as more modern and top of the line, these are very intentionally establishment aspects of product colors in US retail, so if the robot is white people tend to think 'pricey but well made' and a black robot as 'modern, up to date with lots of features' at least that's my experience from being in retail sales for years.
Did you mean to respond to somebody else? You said "I don't think so" to my comment about ABS Plastics being naturally white in color, then talk on end about consumer psychology as if that were relevant.