Not like death would've had any emotional consequences at that point. Neji died, and 20 or so chapters later (which had to be like 1 h in-universe) Lee and Tenten were already joking again.
Though I do agree, Guy's 8th gate was the last time Naruto really gave me a sense of tension, epicness and heroism, would have been an amazing death for guy.
(Never mind that 8th gate stalemating Juubi jinchuuriki was complete powerlevel bs to begin with)
Your opinion doesn't matter, by opening the gate of "DEATH", the user dies. There has never been any exception made or even hinted at. It's expensing the body's final Chakra reserves.