"Preoiling is necessary after a rebuild when the old oil
has been cleaned off. "

An engine being rebuilt should be put together with Moly Assembly Grease on all friction surfaces... this stuff will stay there until washed off by oil......
Most actual oil pumps should be filled or primed before installation on the engine.
The combination of these two procedures should eliminate concerns about initial start up excess friction.
However, I love preoilers.... use it if you got it ....