> What happens if you have an emergency?

You borrow from the 401K. If for some reason that's not an option, you take money out with a penalty, but with sufficient match you are still often ahead.

Even with the penalty and tax, it will be less than 50 percent, making it financially beneficial since the employer is matching 100 percent.

How often do you have emergencies? Seems to me that if your life is going sideways, paying the penalty to get money out of your 401k would be worthwhile; but I expect that my life generally won't go sideways, so the extra percentage of income is more likely to be a benefit than the potential penalty is to be a detriment.