The WiFi isn’t ok. It’s unacceptable. Being next to the router yet receiving half of the throughput is a total mess which means you can’t get very far away from the source of WiFi.
Tech reviewers must add a mandatory WiFi test to let people know about this (in line of sight, out of line of sight, near the router, far away the router alongside a device of reference with a known reliable speed test, etc.) There’s no point for Teclast releasing this product like it is by saving money crippling the connectivity of their products, whether Realtek’s the culprit or Teclast with the Wifi antenna / PCB design because clearly the signal to noise ratio is very low. People will certainly pay more if the WiFi connection is better (or at least I will).