That is true up to a point, but you still need to make sure your lawyer/accountant understands enough about your circumstances to do their job properly. They are experts in their field, not yours, and they aren't telepathic.

Whether or not you spend enough time liaising with your professional help and checking their work, you're still the responsible person ultimately signing contracts and tax returns, and you're still going to be on the hook if the contract doesn't stand up in court or you get audited and something incorrect is found.