This is starting to become important
I used to scoff at the importance of WiFi speed because it used to be the case that our ISP connection was the unquestioned bottleneck for all non-local connectivity (and if you needed fast local connectivity, you could always just plug in), but our cable modem goes at ~100 mbps now. It's not really possible to saturate that connection wirelessly anymore without something like 802.11ac and having the full attention of your access point.
But also, as speeds are going up, it seems to me that the result really isn't a faster or better individual experience anymore. Rather, it's simply that that "maximal" individual experience can scale horizontally better as the speeds go up.