> There may be no perfect solution but I am really hoping something better can exist. There isn't as much trouble in some other countries, maybe we can look into what they are doing?
In France for example there's no SSN used by banks, there's no Credit score either. How do people get mortgages? Bank do their research, ask for your paystubs and other documents, it's simply due diligence.
Due diligence can take you pretty far, for instance for mortgages, probably the biggest loan a person needs in life: current mortgage fixed interest rate are around 1.3% - 1.8% for long duration[1]. You get this without the existence of a credit score. In 2008, there wasn't any wave of people loosing their home because their mortgage was approved too easily and they suddenly weren't able to pay back, so something must be done right.
As an other commenter mentions, you might not be able to get your mortgage approved in a minute on a smartphone app ... But who wants this anyways? In a house/car buying process, this isn't the most time consuming task anyways, and certainly not the one you should approach lightly.
It's true that in the US, opening Credit cards is much more common, but even there, I'm not sure why a couple weeks of wait is much of a big deal, the bank already takes one to 2 weeks to send you the credit card by mail.
[1] http://www.meilleurtaux.com/credit-immobilier/barometre-des-...