I think parents bias to being risk-adverse in advice for their kids because they only experience the downside risk and little of the upside from potentially riskier paths. I think a good parent would communicate some of this, but that's not a skill everyone has.
A lot parents just don't know that much and are over confident (like most people) even if their intentions for their kid are good. Others leverage their power over their kids to force them into certain paths which isn't great either.
Even in more direct ways.
I remember getting yelled at in middle school because I would show up late to early morning jazz band practices I had to be driven to. I was ready to go 40min before we had to be there. I can't make my mom get me there on time.
I think adults forget kids are not independent.
reminds me of my first meeting with my advisor at college to pick courses for freshman year. I came in with a few ideas for courses/majors that my dad thought were practical. my advisor picked up on this almost immediately and asked "okay, but what are you interested in?". we had a nice talk, but at the end I went back to picking from the list my dad approved of. my advisor was disappointed and insisted that I needed to chart my own path through college. my response: "yeah, but I need my dad to write the check".