Is there any reason why one sees so many black PCBs nowadays, instead of the 'normal' green? Is it simply fashion? Or is there a new cheaper / better black material being used?

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I definitely dont like the look of it.. Black chips on a black background.. makes the board harder to 'read' at a glance imo.

Edit: Answered my own question.. https://www.quick-pcba.com/pcb-news/questions-about-black-pc...

It is simply fashion + this : Anti-plagiarism. Because the traces of black PCB are difficult to distinguish with the naked eye.

Also seems there are some disadvantages of not using green.