It naturally applies not only to SRE. Toil is a great equalizer - if 80% of say development work is basically toil then a 10x developer is not really that distinguishable from nor useful more than an 1x (Amdahl's law so to speak :) Amount of toil (and not say failed projects/etc.) seems to be a one of the main factors separating the companies with revenues $2M/year/head like Google from the ones with mere $300K/year/head, and one of the best things a mid/low performing company can do is to reduce toil - though usually on practice any such attempt means something like MBA-style "efficiency improvement" measures and processes which add even more toil.