I would agree if the quality of the leased router was at all up to scratch. I rented one from Comcast once and had endless latency issues, weird connection drop

I would agree if the quality of the leased router was at all up to scratch. I rented one from Comcast once and had endless latency issues, weird connection drops, bad wifi connections, etc. When I moved to another address (still on Comcast) I bought a cheap modem and a linksys router and haven't had any issues since. I get the point you're making -- gotta consider the maintenance burden -- but in my experience that still puts the rented modem/router at a disadvantage. And I'm no networking expert, no genius mind at work, I promise.