Original "Why?" (also when this project was only meant to be run on PCs for debugging): Some Arduino boards do not have a debugging possibility. To find the errors in your sketches it might be usefull ...

why it is still not solved so one can just use this lib for so popular module like node-MCU?:/ `In file included from C:\Users\User\AppData\Local\Temp\arduino ...

Kia ora koutou. I have a wee project in mind involving LED strips with (ideally) a basic web interface to control it. I've done this before using an Arduino, FastLED and WS2812B addressable LED strips ...