yes I sense your frustration. However "many a gem of insight can be gleaned from snippets provided by all" ~ anon comes to mind. Mach has some strong insights into the nature of inertia which, IMO, have yet to be fully realized. [buried under the justifiable attention given to Einstein at the time.] And I am by no means well read on Mach but what I did read blew me away...at the time.