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I think you've answered your own question here. An organisation the scale of google could use a tool like Gentoo to customize and build their binary packages. They haven't, and this perhaps speaks to the suitability of Gentoo as an operating system for use en masse.

Presumably individual engineers are still free to use Gentoo if appropriate but from a support and maintenance perspective the costs may not be feesible company wide.

They kinda use Gentoo. ChromeOS is built with Gentoo's portage. AFAIK Chromebooks are very commonly used at Google.

I guess this is more of an "embedded" usecase and more suitable to a statically compiled target.

Not the same as "using it throughout the organisation" in the sense that their IT personnel need be concerned with.

Are the googlers using Pixelbooks most often?

It also matters to use something that everyone is more or less comfortable with. The more customizations you do, the more overheads you have to deal with.

Well for whatever is worth, ChromeOS is a gentoo based system.