Oh I know that. But compare Amy Palant's performance to say... Cathy Weseluck's as Spike, or Tara Strong's various boy roles, or even Kate Higgins' performance. There's more to voicing young boys than simply having a high voice.
Tails' Sonic X and Shadow the Hedgehog to Sonic Unleashed voice actor. Amy Palant. I think she contributed to people thinking Tails is a girl. Personally I rather liked her voice, but Kate Higgins, Tails' current voice actor, I like more.