Yep, what TK2011 said.
There are too many fast-charging "standards" floating around right now, with USB 3.x, unfortunately.
In the absence of the consortium being really on-the-ball, a few one-offs have emerged, and it's confusing, even if you try to keep track, and is it really *that* important, if your phone charges in 17 vs 20 minutes?
I find that 2.4 is "pretty darn good", obviously not the 3A really-fast-charging rates, but it's usually so fast that I don't care, say if my phone's at 50% and it's going to charge in 24 minutes, seems pretty darn good.
I haven't really kept track, but most battery chemistry would tolerate this type of really fast charging, but it wasn't so good for the cells, necessarily. I figure that mostly charging via Qi or similar isn't so bad, a sort of "trickle" charge mostly, compared to the 2.4-3A deal...
I like my fast-ish charging, sometimes, but it's rare for me.
If you're happy with your charger and it works, well, that's spiffy. If you see something that might work better, and decide it's for you, that's all good too, but either way, we're all using and sharing phone experiences, regardless, at least that's my view.