Does it support kiosk mode or is it configurable to run “locked down” to a single page and full-screen?

This is an incomplete browser engine, suitable mostly for technical contributors. If you're looking for a solution for kiosks, there are good for-purpose products/projects. Examples include: OpenKiosk, Porteus Kiosk, SiteKiosk.

If servoshell doesn't, Tauri will, the Tauri project seemed open to collaborating with Servo as an alternative to OS-provided WebViews

What is optics??

It's a term that has been adopted to sound more professional than "keeping up appearances" which is an age-old concept. It is about how things are/will be perceived by others, rather than the truth of the matter.

The emotional perception of the quality of you, the worker, in the eyes of the leadership who pays you. It is distinct from your true value and contributions. It is maximized by you optimizing the visibility of things that boost reputation and minimizing the visibility of embarrassing things.

Perception is reality. (For better or worse.)

Could have made a hole in the pcb the size of the chips, and flip them so they take up less vertical space which makes the card more flat. Not sure about the uSD card slot but a solution for that might also be possible.

yes, but then JLCPCB would not have assembled it for me. I would not want to assemble a few dozen of those by hand...

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