You say that, but America's traditional villain, Russia, put boots on the ground to annex Crimea. Albeit not with Russian flags on the uniform. It's not all some futuristic fantasy cyber war, and it never will be.
Yet while I'm not advocating starting WW3 over Crimea, given Russia intervened militarily, there arguably should have been more military support for our friends in Ukraine.
I'm likewise not saying there isn't cyber warfare and psy-ops etc, but I'm absolutely saying there are still and will continue to be conflicts where are there are boots on the ground, tanks on the road, and planes in the sky.