If you are just taking about 1, maybe 2, extenders there is no real advantage. Now if you're talking about 2 or more extenders then the advantage is that 1 ext

If you are just taking about 1, maybe 2, extenders there is no real advantage. Now if you're talking about 2 or more extenders then the advantage is that 1 extender isn't handling all the hard work back to the primary access. The mesh network let each unit work with the other near-by units to share the load. The disadvantage is that if you get too many mesh node they start talking to each on who can handle the load the best. That can get quite chatty reducing through put. Eero big push was for smarter meshing (less chatting, more throughput) at a cheaper price.