If you’re going to have people study for 4 years past grade 12, someone’s got to pick up the tab for their rent, food, entertainment, and clothes/supplies at least.
If we disallow lending, that would tend to limit the attendance at “away from home” colleges and universities to the upper middle and upper classes. I don’t know that outcome is obviously “better”. It would be a massive boon to the wealthier families as compared to today.
I benefited massively from student loans and Army ROTC scholarship; I don’t want to see that taken away from future generations (even if removing that would benefit my family).