for some reason the engineers sell it with an external amp/crossover
Lots of good reasons to do this, including not subjecting the electronics to the rumblings of the inside of the cabinet, and vice-versa.
Inside is a 200 watt class Ab amp.
Which is actually pretty fancy, considering even high-end subwoofers come with Class D most of the time.
To add insult to injury, I
noted some made in China capacitors . A disgrace at this price point LOL
The very worst examples of an armchair speaker/electronic buyer are those who throw aspersions without any knowledge at all about what they are talking about. The quality of parts coming from China ranges from the exceptional to poor, like parts in any other place. In fact for many types and ranges you'd be very hard pressed to find a better country of origin than China.
I have not heard this subwoofer, but I think the idea of making an amp specifically with speaker level inputs in mind is quite clever. I suggest to the OP that his snobbery will lead him only to spending money on peculiar pieces of kit instead of enjoying great audio gear.