There was a thread by a union carpenter just posted mentioning this, and he's right – WFH does hurt carpenters, plumbers, welders, &etc. I don't think the PMCs do it deliberately, but it shows a fundamental antagonism currently existing in their class interests. This, again, isn't to villainize any of you, but as long as market competition is thrust on us these contradictions will emerge.
I'm long-term structurally unemployed, so I don't have a dog in this fight. But our struggles are not yet the same. They will be one day, as conditions continue to worsen (not uniformly) amid a global immiseration process. But a unified, worldwide labor movement is still impossible.