Two reasons.
The absence of an emergency fund is supposed to scare you and make you uncomfortable. It pushes you to get through BS2 as fast as possible.
Second, it teaches you to cash flow “emergencies.” If you make a decent living and do the steps correctly, you’ll quickly realize you can.
When we started Baby Step 2, cash flowing a $200 emergency would have been hard. Now, a little over halfway through it, our monthly margin alone would easily cash flow an emergency of even $5k.
Unfortunately, the Baby Steps aren’t magic for someone who doesn’t earn a lot and has a lot of debt. There’s no great way to avoid that math. That’s why they often focus on how someone can increase their income when they call with that situation.