Depends what you're defining as young people. Under 5 as in those quotes, maybe virtually no risk. But I know otherwise healthy people in their 20s who got sick over a year ago. Their sense of smell and taste is still completely fried with no sign of recovery.
Maybe that can happen with a bad flu sometimes, but it seems way more common with covid. It seems like there's some nerve damage resulting from the virus that we don't yet fully understand.
The vaccine seemed like a safer gamble than potentially forever losing my ability to taste, or worse.