Thanks for the additional information information, but with the "ecosystem gripe" I meant that most Overleaf projects are inadvertently designed for pdflatex simply because it's the default. No matter how much better other compilers are, pdflatex is the de facto standard in certain circles, even if few within these circles are aware of this (e.g. university laboratories), so I've had to begrudgingly switch back to latexmk for most projects to accommodate this.