What I expected when I purchased Deco(M4 & E4) was :

Every Deco would connect to multiple available Decos so that it would NOT cut the bandwidth in half everytime the signal jumps to another deco. 

What I see now it that they are just multiple repeaters, not capable of connecting to multiple decos, just 1:1

Mesh vs Repeaters

Just look at the connection lines, looks like a web of connections, hence the term "MESH" 

I think this is possible using ethernet cable, but it defeats the purpose of buying this device. I hope the devs would consider applying this true concept of "MESH" in wifi networks.