Also imagine you are a company with a reputation for hiring people - inducing them to leave their current job - and then often dismissing them quickly afterward

Also imagine you are a company with a reputation for hiring people - inducing them to leave their current job - and then often dismissing them quickly afterwards. That would give many great prospective employees pause before applying to work there, because you are asking them to give up a good thing and take a chance on your company, without commitment. Far better to screen early.