Smallest features are around 13nm due to EUV wavelength. I think people incorporated hacks to etch smaller stuff but not much smaller.
I think it is similar stuff as with Moore’s “law” that is not an actuall law only a trend or myth.
In the 70’ 80’ 90’ that number represented an actuall size and it stuck into 00’ 10’ and 20’
“Love” is the answer.