Well, that's the way you change the thermostat, easily......with the throttle body out of the way you can get at both bolts easily......do it it on a cold engine, because you don't want the crossover exhaust pipe hot....
I have seen guys do it other ways......remove the crossover pipe, or just loosen it, but sometimes you snap the studs.....
Other guys remove nothing, they just get in there with special quarter inch socket swivels and wrenches....takes a lot of patience though.....
Was the vehicle running ok before you messed with the throttle body?