I see the "tireless" narrative (used around teaching, nursing, volunteering, doing activist work, etc.) as a manifestation of #ableism under capitalism. It judges those with a lot of energy as superior humans to those with less (on a metric of quantity rather than quality of work produced). It implies that those who are not tireless are not fit for their work, or (particularly insidious) maybe just don't care enough. This results in good people leaving professions and causes through burnout, and discouraging others from even trying. The "tireless" myth suppresses rightful critique of unsatisfactory working conditions (including any accessibility issues). It values one right way to work, and one right amount to be doing (i.e. giving your all, the alternative being nothing). None of this is helpful. Better to be able to appreciate not only standard models but diverse ways of contributing to society, including the part-time, the occasional, the unconventional.
@Julie