I like to think of solutions and not problems, and costs:
There are too many bugs in the code. Okay. Why? Well we don't have good testing set up. Why? Because time was not allotted for writing test code. Why? Because it was rushed. Conclusion: You either pay the cost up-front or after-the-fact. Either way. However if this is a constant thing then the real problem is: "You have too many features being built for the size of your team, either increase the size of the team, reduce features, or prepare for big problems."
From personal experience I can say me working at "optimal" power, that is optimal sleep, no external life problems, not sick, generally very happy is maybe 30%-40% more productive. That seems like a lot, but if you need 500% the productivity, you ain't gonna get it by making a person feel like junk, not get needed rest (vacation / day off), not letting then handle family issues, etc. I can get a developer working at 100% more productivity, but only for a short amount of time, then they burn out which requires EVEN MORE rest time.
There are too many bugs in the code. Okay. Why? Well we don't have good testing set up. Why? Because time was not allotted for writing test code. Why? Because it was rushed. Conclusion: You either pay the cost up-front or after-the-fact. Either way. However if this is a constant thing then the real problem is: "You have too many features being built for the size of your team, either increase the size of the team, reduce features, or prepare for big problems."
From personal experience I can say me working at "optimal" power, that is optimal sleep, no external life problems, not sick, generally very happy is maybe 30%-40% more productive. That seems like a lot, but if you need 500% the productivity, you ain't gonna get it by making a person feel like junk, not get needed rest (vacation / day off), not letting then handle family issues, etc. I can get a developer working at 100% more productivity, but only for a short amount of time, then they burn out which requires EVEN MORE rest time.