As a disclaimer: I must warn you that this article is not too technical, but we will undoubtedly talk about 802.11 technology and gears. But mainly - let's talk about density.
I love elementary questions, because they (just like elementary particles) on the way to their own depths lead to infinity. When we come across the phrase "high density Wi-Fi", we just want to ask an additional question - what density are we talking about? What is high density? The answer, as always, is not as straightforward as it might seem.
For example, here are a few definitions that I googled relatively easily.
"High-density Wi-Fi networks (hereinafter referred to as HVD) are understood as a wireless environment with a high concentration of users, where users are connected to a wireless network and intensively work with network services" ( source )
In the previous article, we deduced one of the main rules of Wi-Fi: "While one speaks, the rest are listening." A logical question arises - once at each moment of time only one device transmits, is there a fundamental difference between, roughly speaking, one hundred clients at 1 Mbit / s or one client at 100 Mbit / s, if all the data will still be transferred in turn? What density are we talking about - the density of data transmission in the air?
The following definition:
“When one client device has less than 1 square meter of area, we can assume that your facility has a high density of Wi-Fi connections” ( source )
How is the distance between clients related to the design features of a Wi-Fi network? Again: will I design the network differently if there is 10 times the distance between clients, but they will transfer 100 times more data?
Another definition:
“High-density Wi-Fi is a design strategy for large deployments to provide pervasive connectivity to clients when a high number of clients are expected to connect to Access Points within a small space. A location can be classified as high density if more than 30 clients are connecting to an AP "
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And it probably won't be better. At least until 6E - but this, as Kanevsky says, is a completely different story. In the meantime, your home Wi-Fi has the same density as the office one, it just doesn't know about it yet . You need to know yourself - and better in advance!