The more experience someone has, the less likely they are of stuffing up in their next job. It's true, by having previous employers - they are the ones who have had to put up with pilots making mistakes, which is costing them money. AND pilots do make mistakes, because there are some things you can only learn on the job.
Nowdays, twin and turboprop operators are not going to have the luxury of picking super experienced pilots. They are going to have to employ people with <500hrs multi - and implement a training program which reduces the risk of making mistakes, which would have otherwise been learned in previous employment. That's just the way it is.