Part of #130921

Right now, we have a mix of error handling that may be confusing to users.

• Sometimes a success boolean is returned.
• Sometimes an exception is thrown if there's a problem.
• Sometimes Impeller validation will catch problems and rendering will fail.
• Sometimes the Impeller backend will allow something invalid to happen and rendering will silently fail unless the user has Metal or Vulkan validations enabled.

Recommendation: Bias heavily towards exception throwing.