The basic idea here is that the BitChat application on smartphones faces limitations due to the restricted range of Bluetooth, which is optimized to save battery life. For mesh networking, you want to maximize the transmission and reception range. This can be achieved by enhancing the power supply, using better antennas, and other improvements. Once people understand the benefits, there will be an incentive to develop custom hardware that performs better than a standard smartphone for this purpose. The technical details are useful for those with a more technical background, but that's the main point.