I cut them off and sometimes the first foot of useless level line off too
Did you mean the first 6-12" of very fine tip just behind the welded loop ?
I think manufactures, like RIO, before they started to make lines with front loop, were adding 6-12" front tip to be used for tying a nail knot.
Over the time this tip is being reduced. But I have no idea why they still incorporate the tip with welded loop?