From a QA perspective the requirement for engineering drawings is that they fully and unambiguously define the design, and the effective revisions are available where needed and when needed, with little effort.
I don't think that NBs or the FDA check engineering drawings from an engineering point of view in routine (not for-cause) audits. It's not their job, unless the regulation requires a design examination (e.g. MDD Annex II s. 4).