While the terrain of I-40 may be a drag on a bike, the lack of gas stations, lack of consideration for motorcyclists, and general "Omega Man" spookiness between San Antonio and El Paso makes I-10 a bad idea on a bike. You definitely don't want to fool yourself and say "ah, I'll just do it at night when it's cooler". It doesn't get much better on the other side of El Paso, either, as once you get through the El Paso-Las Cruces corridor, you're in "The Hills Have Eyes" section of New Mexico and Arizona. It's kind of deceptive because it starts out ok, but once you get to Fort Stockton, you realize "this is a bad idea", but you're already past the point of no return.
It might be worth it to do it for the "Achievement" (though it's not going to pop up on your screen), and you can always take a detour up 70 to see White Sands National Monument, which is kind of a once in a lifetime type of trip, because no one ever really says "I am crazy enough to do this twice in one lifetime".