I can understand why the companies that operate the charging points don't want to invest in equipment for which utilisation rates are low. However, the customers (EV drivers) don't want to have these frustrating experiences. If they happen too often, word will get around and the uptake of EVs will be slow. Approximately one in four experiences being frustrating feels too high.
I have seen an example where a more customer-oriented approach has been taken. At the Oxford M40 Services, there is a row of about 5 Tesla charging points. That's the way to do it. The charging infrastructure should be installed in advance of the demand. As an example, the number of charging points in place should be sufficient so that on, say, 95% of occasions, the average EV driver arriving at the site will be able to park up and plug in first time. In early take-up, that probably means there should be twice or even three times the numbers of chargers in each location than that suggested by models of utilisation for charger efficiency. However, once a large proportion of cars are electric, this ratio will diminish. When almost all cars are electric, the ratio will fall to somewhere between 1 and 1.1. Think of it in similar terms to the ratio of parking spaces to cars wanting to park. Exactly the same proposition. If you arrived at a car park and there are no available spaces, frustration. If someone was creating new car parks specifically for your type of car, which only a few thousand people up and down the country drove, you wouldn't expect them to create those new car parks with only one parking space in each. The ratio of spaces to users would need to twice or three times the number of users, to significantly reduce the chances of someone arriving, only to find that someone else was already parked there. Later on, if almost everyone had that type of car, you'd expect that ratio to drop to nearer 1 - perhaps 1.1.