EE is not a breed so there is absolutely no standard for them in any form. So it is completely up to your own tastes if they are "preferred" or "culls". Ditto for colors, or even the beard/muffs- if you prefer the clean faced look, then go for it. Nobody can tell you they are "wrong".. no standard, remember..
One thing though, if it is the same sort of rumpless as on Araucanas- which is basically missing the whole tail(the parson's nose/bony lump below all that feathers) then it's not a real concern in any way. However there is another sort of rumpless that apparently is not very desirable called roach back which is a recessive and also distorts the back in some way(have never seen any examples of roachbacks).
Since you don't mention anything else about those birds, it's likely the usual rumpless anyways. Rumpless is also dominant which means it will show up in the crosses although the expression can vary a bit, from birds showing a few tail feathers(also often pointing in odd angles) to birds completely missing the whole tail.