That is what they say, but I’ve owned it probably 90% of the time from 2009 until now, so you be the judge:
Helped me take a 100k roth conversion in 2008/2009* (not all of it invested in QLD - but the always the largest holding) to just over 900k. If only I had simply left it alone and never sold it.
*Back when we had that special option to do a conversion and spread the taxable income over two years.