At first I'd say so, but let's set a figure for what a LE really is (or should be).
There are LE's of 10/20 watches, made for boutiques, which nobody will likely ever see.
Do those LE's decrease the value of the watch?
Not at all, the overall quality is still the same.
LE like the 10th anniversary sketches has attracted more investors than collectors, but that's the same tactic that any brand is using, money and resale value have become relevant features to gain consensus