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Disclaimer, I'm not a network professional im only learning. But you dont need ufw since your router firewall should be able to filter majority of the traffic. But in security there is a concept of layers. You want your router firewall then your device firewall to provide multiple layers incase something slips through one layer.
So to give a simple answer, it depends how secure you want your network to be. Personally I think UFW is easy so you may as well set it up. 5sec of config might stop a hacker traversing your network hoping from device to device.
This is the best answer. Your router protects you from the outside, but a local firewall can protect you from someone prodding your lan from a hacked camera or some other IoT device. By having a firewall locally you just minimize the attack surface further.