The gcam port was a huge help over the stock camera! I came from a Pixel 2XL and with the gcam port on my OnePlus 7 pro allows me to take better photos. The Video recording is far superior than my Pixel 2XL could do by a huge margin! I tend to use the gcam port for pictures and the stock camera for video recordings.
Another thought...
The triple camera is nice, but I'm finding I don't use the telephoto lens much, same with the wide angle lens. For those occasional times I do want to zoom in close or take a wide angle its nice, but overall it feels a bit gimmicky and not entirely needed. Kudo's to all the cell phone manufactures for selling people on the triple camera's!