He was certainly concerned with getting the full tonal range out of every exposure. His prints had a depth that digital fails to match: rich, deep blacks, detailed mid-tones, subtle highlights. To see an exhibition of prints by Adams (or many other photographers, going back pre-1900) is to realise the lustrous quality that was available from large-format cameras and lenses.
Yes, if he were alive today, he'd no doubt investigate the potential of HDR. But I feel sure he would tackle it in a careful, methodical way. The results would be amazing, I'm equally sure... but he wouldn't go in for eye-popping effects. He was too good a photographer for that...
I was lucky enough to see an exhibition of prints by the man himself quite recently. What struck me was just how much darkroom manipulation he must have been up to. I'm not therefore sure how much of what you see is the result of the format, and how much arises as the result of his obvious dodge/burn/develop skills.