That introduces new problems. Hiring someone only to realize they are a bad fit, and then firing them is bad for both the employer and employee. Bad for the emp

That introduces new problems. Hiring someone only to realize they are a bad fit, and then firing them is bad for both the employer and employee. Bad for the employer because they wated resources on on-boarding and compensating the employeed. Bad for the employee, because of they spent time working for a company that fired them instead of looking for a different job they could keep, and may have made other sacrifices for the job, such as relocating.