A big PITA for me right now with friends and family is changing DNS. They all have these Xfinity cable modem boxes that have integrated WiFi and Ethernet. It's not possible to change the DNS through the web interface. So I have to convince everyone to buy a separate AP or a 3rd party (but ISP approved) cable modem, and then what ensues is I'm now responsible for that device because Xfinity washes their hands entirely if there are any problems.
It's also a PITA to change this on each device.
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