I've lived in Washington state for three decades. Washington has had shall issue concealed carry since the early 1960's, so we have a little experience with it. There is no prior experience requirement , class, or test at all - pay the fee, get fingerprinted, and you get the permit.
Requiring training is one of those no-brainer common sense things - of course you should have to be trained, right? But you know what - I really don't hear of incidents where untrained CPL (Concealed Pistol License, as they are called here) holders do something bad where training would have helped.
I recall one incident where a college student/frat president turned 21 (min age), got the permit, and a couple of days later did a drunken driveby of a rival frat. But I doubt that training would have helped (Instructor: 'no, Johnny, the CPL doesn't authorize drivebys of people you don't like'). You hear of people shooting fleeing burglars occasionally, but that doesn't involve a CPL.
To be clear, I think training is great. I've paid for three weeks or so of it over the years. The notion that bad things will happen if it's not required seems like common sense. But - I don't see the real world results bearing that out.