I'm sorry, but whilst aspects of what you say are correct, it is extremely US-centric in its worldview. For most of the world Tesla is still in full-blast network build-out mode and so needs to be at the lower end of the contention ratio range (.... 40) rather than the higher end ( .... rising 67).
What you have written may - or may not - be a perfectly valid explanation of the Tesla build-out strategy in the USA. I simply don't know, though I suspect you are largely correct, but I know that I don't have the data to be sure. Tesla does have the data, so I let them get on with it, and I try to get better data whenever I can.
However outside of USA there are still huge gaps in the network that simply have to be filled at the same time as building density in the conurbations, even more so as Tesla increasingly accesses European and Chinese market segments that don't have their own driveway and/or parking place. Both the gaps and the density matter. And both contribute to contention ratio (which I can track) and other things that I cannot track - such as utilisation ratio; time per charge; kWh per charge; time of charge; diurnal/ weekly/ seasonal variation; SoC on arrival/departure; journey length/duration; vehicle model; occupancy; etc. Given all the things that I would dearly love to know, but do not know then inevitably I must fall back on the one metric that I can track with confidence.
As a for-example re the gaps let us consider northern European families that holiday in Greece via road-trip. This is quite common, the driving season is not just a US-phenomenen. I've just driven that road through the Balkans and it is not currently viable using the Tesla charger network. So for that family contemplating buying a Y as the high-end vehicle in what would be a typical two-car European family's car-mix, they simply will not press the 'yes' button on the Tesla Y purchase. Within 18-months we need them to be pressing that 'yes' button. Here in Europe, in China, in Canada, in Mexico, in Australia. And soon after in Brazil, India. So for the next several years we should expect/hope/anticipate that contention number to trend downwards rather than upwards.
I am very glad to see that as a company Tesla is not overly US-centric. On some things yes, but the balance is within the acceptable range, which is contributing to the success of Tesla. That matters to me as an investor, and it is why I watch things like contention ratios and connector styles and model development and etc quite closely.