We are aware of the criticisms of GOTO, which, given a superficial understanding of the anchor tag in HTML, the programming language, may come to mind for some programmers (mainly juniors). A full response to this criticism is beyond the scope of this document, but, in summary: you are wrong

For future reference I recommend the brand “athom” for smart light bulbs, they come flashed with tasmota, wled or esphome and you can also flash whatever you want on them

You still need to read the variable in each iteration, but the cost of that is probably negligible

I was gonna print one of these chains, what would be a good design?

Honestly what worries me the most are the fumes

JLCPCB has a 3d printing service

Here’s some official info on this: https://github.com/raspberrypi/hats/blob/master/designguide.md#back-powering-the-pi-via-the-gpio-header