No. Most devices should be connected to the coordinator via routers (mains-powered devices). Messages sometimes take several “hops” to reach it. The coordinator can connect directly, but it shouldn’t be doing it for more than a small number of devices.
Bear in mind that connections change all the time. Each device should automatically switch to the best available route. The ZHA map is only a snapshot of the network, and it contains all possible routes, not just the ones in use.
If devices are suddenly not connecting, you might look at changes in the environment.
- Have any of them been moved?
- Have new ones been added?
- Are there any new sources of interference? Bluetooth proxies and other wi-fi devices are in direct competition with Zigbee.
Lots of good advice here: