Correct to a point.
The rear tire is sitting right there up front 'under the edge of the vehicle' waiting to go on, so it is only a matter of seconds that the jack is holding anything. I can have the tire on faster than setting up a jack stand 'under' it and then I don't need to go under at all.
Something like changing a flat tire. You have the spare sitting right there so you don't need a jackstand.
I normally will slip the front tire I just took off under the edge of the vehicle for the time it takes me to spin on the nuts on the replacement tire, but 'not' touching tight, just there to catch.
I figure it is just as easy to lay the tire just under the edge of the vehicle while it is waiting to be put on as to lay it anywhere else.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's - Gone to the rust pile...