Seems like a pretty harsh review, in my opinion...
Sure, this drive can't keep up with those other drives, but it doesn't claim to. And those other drives don't come anywhere even remotely close to the X6 in price. This is in a price class of its own, both in 2TB and (especially) 4TB options. I think price/perf should have been given more consideration. It almost feels like this review is comparing two different classes of hardware, like if you were to criticize an R5 CPU for not being as fast as an i7 that costs 30% more.
It's a bit puzzling that half of the competing drives had a 3-year warranty as well, but that was not a "con" for any of the others.
In any case, thanks for testing it out. It looks good enough for my use case, so unless an even better value proposition comes along, I'll probably get this in 2TB for my next external drive.