About my corebook X, poor memory and ssd

Hi people, i want to share my experience
I have buyed a Corebook X, and It’s this what i got different from youtubers review:

1 stick 8 gb ddr4 (do not have memory direct on motherboard)
NVME max reading speed at 380mb/s (youtubers: 1000mb/s)

So I replace de 8gb 2400mhz for a 16gb 3200mhz, I can put this to run at 3200mhz? I soo sad that my laptop will always be single channel

Is it worth it to upgrade nvme to a 3500mb/s?
And why my corebook X is diferent from the youtubers reviews?