The "just" in your response sounds as though wired is bad. For anybody following along and still learing wifi basics, it should be pointed out that wired APs are usually preferred...if possible, as a first choice. Yes, in cases where a wired connection is not possible, then a dedicated back haul channel is indeed superior, and considered a true mesh system.
But it still takes some knowledge (or at least luck) to build a good network as signal strength between the APs become an essential element of the design and install.
For anybody looking, a new player in the pro-sumer market is Synology. I have used and very much like their previous wifi routers, but their new system is reported to be a true mesh and modular setup:
MR2200AC. Hoping for good things, especially the 5G channel for back haul....but never used one yet. Biggest downer: not a sexy box.