Nublet question: why would you want to set up DHCP on a router vs using the DHCP feature of a server environment?

So I’m still new to IT and I’m still getting used to everything in a real world scenario, I know at least on Cisco routers you can set up DHCP on them, but you can also do the same through Windows Server (at least, I would imagine you could do it through a Linux environment too). So now what would be the benefit of setting up DHCP on a router when you could have it all on your DNS server? Or would that just be something for smaller environments that aren’t able to have multiple servers?