Can someone explain why people are having issues with taking a QB in the first round?

If we can snag Jaxson dart or Ewers later in the 1st I say go for it. I understand what’s at stake next season and we need some pieces but I feel like everyone is forgetting we can sign some free agents as well to fill those gaps (there isn’t many gaps.) we do however need a QB for the future and why not take a first round caliber qb? The free agent market for quarterbacks is absolutely horrendous.