Every parent should be gassing their kid up though. Most of our "successful" people are just normal kids that never hit a wall or had help getting around walls. Realistic expectations are what keeps people from jumping jobs for a raise; applying for positions they don't fully qualify for; moving for better job market access; retraining for management roles; and so much more.
Note, I'm not talking about rags to riches, success can be a first generation college graduate getting a professional job; a homeless kid getting a steady job and pulling their family off the streets; a burnt out delivery guy getting a union warehouse job. The point is people with low expectations don't look for new opportunities.