Because onboarding, unfortunately, is often a very negative experience and a lot of people feel this way - their concerns should be addressed (you may have noticed this post is based on mentoring sessions). In addition, most people don't like feeling "worthless" for 3-6 months, so even if that's the company's expectation, it's going to make new hires feel bad for those 3-6 months. If that's your plan then you might be giving your new hires that same negative experience. Imposter syndrome is not the real issue here, it's the onboarding process itself.
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Because onboarding, unfortunately, is often a very negative experience and a lot of people feel this way - their concerns should be addressed (you may have noticed this post is based on mentoring sessions). In addition, most people don't like feeling "worthless" for 3-6 months, so even if that's the company's expectation, it's going to make new hires feel bad for those 3-6 months. If that's your plan then you might be giving your new hires that same negative experience. Imposter syndrome is not the real issue here, it's the onboarding process itself.