Not sure exactly what the quote means: "There aren’t many soldiers or marines who would voluntarily dump kit and risk their own lives for some vague idea about the collective good."
But, if it's implying that not many in uniform would dump kit to save tactical execution, then the article is way off base. Soldiers and Marines are dumping kit constantly in order to save weight, move around, and execute the tactical fight.

We're going to have to accept that there will be a few more dead bodies with holes in them where a SAPI plate would have covered them. Or, we're going to have to accept tactical defeat.

Unless the DOD is willing to allow (and provide) real performance enhancing substances, then human physiological limits will have to be taken into account.