I was reluctant to change also, and had I known before the tech showed up that they were going to switch to fibre ("oh, didn't they tell you that when you placed the order?"), I probably wouldn't have done it.
My network is mostly wired, including the PVR which is connected to the HH3000 via ethernet. I still have a VIP2202 so I can't comment on the 4K box, but I do have a wireless STB in the dining room, which works flawlessly, and getting rid of the separate VAP was a plus.
Never had any wireless problems. Granted, I live in a condo so I'm never very far from the hub.
Samsung Smart TV | Bell Fibe | Apple TV 4K | Pioneer 919AH | Panasonic BD75 | Bose AM6