I largely agree with that, I can't speak for elsewhere but in the UK my understanding is the rental scheme was introduced as a temporary way of allowing a greater number of people to try the Escooters during the trial period. My guess is the trial is largely to gauge public opinion and to assess the risk.
Clearly a rental only scheme isn't ideal as a long term solution but I do think it does have merits during the trial. Rental machines will be properly maintained, traceable, and have some blanket insurance. It does allow for greater rider participation than if the scheme weren't in operation.
On the downside my guess is the trial has caused more negative publicity than positive and I remain convinced the EUC community will suffer as a result.