Cuz as stated I need to get my project to be done in time. If I not yet get in done by the time, possibly I will get fired immediately. But as long as I get in done, there will be chances I can get to amend it, means I can fix the consequences made while rushing the project.
In the case of getting one project done on time, others will notice the lack of professionalism and if it is severe enough, they may not trust you on other projects with having chances to fix the mistakes, others may still notice them. We live in a society where mistakes are noticed very quickly.