I thought there's no way it's the new 2020 version at this price - I thought it would be the older Google Wi-Fi devices.
I have the Google Nest set up. In my 1960's 2 storey, I bought a 2 pack last spring because people were complaining. In the fall, I set up a small office in another room upstairs and the signal was poor with lots of drop outs. I knew I'd need a 3rd point to get that room good coverage, so I was on the look out for a sale on one of the points. I came across another 2 pack on here from Staples with a coupon that worked out to be a great deal and set both those points up. We now have rock solid Wi-Fi literally down the street from our house. It's overkill, but it works well. Before buying the extra points I tried moving the two points (one point and one router) around the house, but when I'd improve one side of the house or one floor of the house I'd wreck the Wi-Fi in another part of the house.
I probably could have sold one of the points and still had great coverage, but not hearing any complaints about Wi-Fi from the kids - especially when there are so many of us online for work and school meetings at the same time is worth keeping all 4 points.
I think when they state the square footage for each point, they are looking at a "modern" open concept home. Add in a few extra walls and you can use more points than you think you will need.