I have found these nodejs desktop apps to use less RAM than other more traditional Toolkits like Qt. I can live with more disk space being used if it means better memory usage
Extraordinary claims such as these need at least some sort of evidence. It does not make sense intuitively that a browser engine has a lower memory footprint.
It could be that it's the other programs that are also bloated.
That's good news. I did some searching to find some real comparisons, but most of the links I found were related to memory leaks (nothing from 2016 though, perhaps outdated).