Turning off the iwatch's Wi-Fi won't have much effect on its basic functionality, but it will affect its wireless connection and data interaction with your phone or other device.
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The Wi-Fi function of the iwatch is mainly used for wireless connection with mobile phones or other devices to achieve data synchronization and transmission. For example, with a Wi-Fi connection, the iwatch can update weather information, receive notifications, sync music, and more. If Wi-Fi is turned off, the iwatch won't be able to keep real-time syncing with a phone or other device over those wireless connections.
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However, even if Wi-Fi is turned off, the iwatch can still stay connected to the phone via Bluetooth to achieve basic watch functions such as time display, health monitoring (such as heart rate monitoring, step count, etc.), basic notification reception, and so on. So turning off Wi-Fi doesn't completely disable the iwatch.
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In addition, turning off Wi-Fi can also help save the iwatch's battery. Because the wireless connection will consume a certain amount of power, especially in the case of unstable signals or frequent connections. So, if you don't need to sync data or receive notifications in real time, turning off Wi-Fi is a good power-saving option.
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Overall, turning off the iwatch's Wi-Fi won't affect it much, but it could affect its ability to sync with your phone or other device in real time. Users can determine whether to enable Wi-Fi based on their requirements and usage scenarios.