yeah, you're right about that, but given how difficult these things can be to actually measure in reality, I think an indirect measure is better than no measure at all (or a gut feeling). A lot of these races with heavy suppression were extremely close races, which obviously begs the question of how effective the voter suppression was and if it turned the tide (my money is on "almost certainly).

It turned out my vote was not particularly instrumental in the election I was participating in, but if just assumed that from the start I definitely wouldn't have gone out canvassing and trying to convince other people that their votes matter. If other people like me made similar decisions and didn't vote and didn't try to mobilize, would the election I participated in still have gone favorably? Maybe, but I know I sure felt a hell of a lot better doing everything I could than sitting on the couch worrying and fretting about things instead of actively trying to influence them.