@STN 

This much for saving the earth...lol.

Their motto was to literally not throw away old equipment. 

@Kevin_Z  

hi may I have your update about the firmware for one mesh system in between 2 supported one mesh routers.

Since this reply passed a year.... hope your team don't let us disappointed...

@Rockylhw 

I think this is not gonna happen as I think that the lack of this feature is mainly because of marketing decision. Best solution for us, users, would be to spread these news over whole internet and try to decrease Tplink customers. Maybe this will change their minds.

@ftibor I am wondering, until we have discuss here the problems, does somebody from the TP-link read them /will give a proper answer?

This is only technical questions, I think they should respect the our problems/ questions 

same situation here - its real bummer that one mesh is not supported between routers.

I also expected two OneMesh routers to be able to create a mesh network, along with other RE / PLC devices. This is absolutely ridiculous. I've been a long TP-Link customer and have recommended the brand to many... but this is highly disappointing. I've been waiting for OneMesh updates on my A7 and AX1500 for a year. Then it finally comes, and I can't even use it without purchasing new hardware I don't even need.

@jigouttrev For the latest in CES they developed something called EasyMesh which can connect 2 or more routers in a mesh.

Yes, it's brilliant! First, sell onemesh - routers and extenders, and then - all this to the trash heap, because now we have easymash ... carry your money ...

@Aashish_AS That is absolutely ridiculous. They should upgrade our firmwares once again with EasyMesh then.