I use a Bambu P1S with the machine in the garage, about 40ft from the main WiFi AP. The RSSI according to my phone is -85 to -92dBm which is awful. The spectrum is crowded with the neighbour's toys and channel hopping is continuous.
I have had zero wifi related issues with this printer. The value of being able to CONFIDENTLY run a large print without me touching the printer is wonderful. I can complete the 3D model, send it to the printer and head to bed. Then at 2am, check on the job using the built-in camera, and go back to sleep (or rush downstairs to deal with the spaghetti).
Other than the image data, the amount of information being sent is very limited. At the beginning of the print cycle, the g-code is uploaded and then only the telemetry from the machine (+ images if requested) is exchanged with the computer app. The app and computer can be offline and the printer will complete the print, so continuous connection is not needed. And there's always the SD card if the wifi is broken. On the Bambu P1S there is no USB port for direct connection to the PC.