They say it because it is almost universally true. For every one person with your experience their are 100 with the exact opposite experience. I've been on this and other vaping sites for over two years and have gone to 3 or 4 vaping gatherings with many vapers. I'm not making this up. Plus it is just the physics of how batteries work. The way you vape must be considerably different than the average person who vapes.
If the numbers are really that bad, I must be exceptionally lucky.
I don't chain-vape all day long, that's for sure, but I use it on and off throughout the work-day, a bit like the way I smoked.....and I smoked 2PAD. I'm using 16mg. and definitely inhaling vapor more deeply than I did cigarette smoke. Anyway, I've been more than a bit surprised by how many people seem to go through scads of hardware/juice combinations before they find just the right combination.....Perhaps I'm just easy. *shrug*