Here is the thing. If you have a Convention Manual which calls for a certain color for bike sheds, then you use that. Failing that, if you have several other bike sheds of a certain color, then that's what you use, for consistency with existing bike sheds.
The color of the bike shed only doesn't matter if it's the only bike shed, and there is no documentation which has already settled the matter.
The rule there is that it doesn't matter how many style guides you have or tools to auto-style your thing or whatnot people will still find something to nitpick and argue about.
If the Convention Manual says all sheds shall be green they'll argue about what shade of green. If it says it should be Magellan Green they'll argue about whether it should be clear coated and what grit should be used to prepare the surface. It never ends. They'll argue about whether the window frames should be the same color etc.
And per Sayre's Law[1] the more inconsequential the decision, the more intense the argument will be.
[1] https://en.wikipedia.org/wiki/Sayre%27s_law
We are a continuous learning organization, and selecting this bike shed’s color is an opportunity to leverage everything we’ve learned since the last bike shed project. It’s a fast moving space, and we’re a different team at a different point in time. The color we selected in the past may not be the right color today. In fact, this is an ideal time to consider a bike shed color transformation program to update all legacy bike shed coloring for consistency.
How boring to have all the bike sheds the same color. I've seen the end result of that - all houses in every direction are 100% identical, both the paint color and the facade in front. I guess they sold them, but I don't understand why anyone would want to live there.
Wouldn't you change the color if there's existing bike sheds of the same? So you can reference them by color.