You don't say what or where you're from, even in your profile....go on! Just a clue what continent?
What you describe is pretty well standard in many places. A legal copy has to be kept- this is easiest if it the retained ground copy. Nowadays, in BA, all flight deck paperwork is disposed of if not required for further examination. Original legal copies of loadsheets would only get lost with all the other gumpf anyway- better they retain the original on the ground? What do you see is the problem?