Some other folks already pointed out the aspects of not being in rhythm offensively, making it a 2 score game which in turn puts pressure back on MSU and other factors. Taking points off the board is rarely a good choice.
My bigger problem is exactly what you noted. Sark sometimes has what I consider to be a bit of an issue is adjusting his plan or script to in game realities.
We as fans recognized the items above about rhythm and pressure. Sark admitted to his mistake. Why, in game time, didn't he recognize that the slight momentum tilt that keeping the 3 on the board would give Texas? Had it been say, 4th and 2... maybe. 4th and 4 is a bit of a different story. Because he had already decided to go for it, he couldn't come off that when offered the chance. THAT is what concerns me. Adaptation to what's happening real time. Our Oline was getting hammered, our WRs weren't playing great, and Arch was a tad off. We all saw it. Why didn't Sark see it and keep the points? This is just one example but it makes me nervous as this isn't the first time he's stuck with a game plan (big or 1 play) that he probably should have altered for a variety of reason, but didn't.