How do you know if the Rear Wheel Bearings need Pressed in or not on a 2004Hyundai Sonata 4-cylinder?

How do you know if the Rear Wheel Bearings need Pressed in or not on a 2004Hyundai Sonata 4-cylinder?
Wheel bearings should always be seated. check for clearance behind them after they have been installed. if there is play then there is a problem. However after being a mechanic and an industrial technician for 14 years now I can honestly say that I have never seen a set of roller bearings being pressed in. the very nature of roller bearings does not allow for them to be pressed. The bearings roll on the shaft and the housing. if they were pressed in then the retainer that holds them together ( making up the body of the bearing) would be crimped, thus destroying the bearing. Industrial applications usually require the bearings to be pressed, but are differently designed altogether.

Also if the bearings came out by hand easily then they were not pressed in. Even if they were just a little firm. This just indicates that they just had a little weight on them in operation.