How much “weathering” is appropriate, if any at all, is a matter of personal preference; I like my models to look as if they’ve seen a fair amount of action, others like a pristine, ex-works finish. Also you can see that the lettering looks obviously hand painted, as it should do for a WW1 aircraft; accurate, computer generated transfers just wouldn’t look right.
Some of my comments during this thread such as
“ I don’t worry about the odd scratch or dent” may have given the impression that a “weathered” finish is an easy option, I can assure you that it isn’t! To get the correct amount of wear and /or damage in the correct places so as to make the model look “real” is a work of art in itself. Some scratches and dents can be left; others can’t and have to be repaired.