Those rolleyes aren't necessary.
The real advantages of CXXC are not those you claim. (Read my test report!) In fact, what you say is simply not true:
1. To be able to work
any tile, it must be a) within your cultural borders & b) within two tiles of a town
2. Because OCP uses culture, every town once it reaches CV 10 will have 20 tiles to choose from (minus overlap, ie 18-20 tiles per town)
3. Because of the tight spacing of CXXC, each town will have only the immediately adjacent tiles available plus the closest, unused tiles of its neighbours. Mathematically, it works out at eight (8) tiles per town
4. As the OCP towns have more tiles to choose from, they can work the best tiles and ignore the worst tiles until the advent of Medicine and hospitals. Rarely do you have to irrigate bonus grassland or mine grassland. That only 12 of the 18-20 available tiles can be worked is not a disadvantage, it is an
advantage!
5. With CXXC you have little choice but to improve and work
every tile, even if it is "only" grassland or mountains. Some towns may have no other option but to irrigate BG just to get enough food so the mountains can be mined and worked. Other towns will have no choice but to mine grassland to get more than one shield. For science or worker farms, this matters little. For everything else, it is bad news
6. Given the
same number of towns, OCP will cover more than twice the territory
7. Given the
same number of towns, OCP will have access to a larger number of resources, luxes, hills and bonus grassland - as well as marginally useful tiles such as desert, jungle or swamps.
8. The two food of the town has zilch to do with the need for irrigation. Think of it as a domino brick! It allows the town to work one more tile even if it is a foodless mountain. As long as that tile produces at least one food, it will grow to work one more tile and if that too yields at least one food, these two tiles can be worked indefinitely. If the first worked tile yields two food, and the next, and the following ones too, the town will eventually grow to size 12. It is if you need to work mountains or several hills that you have need of irrigation in order to allow the town to work those tiles, even more so if you want it to grow!