Selenium is going to remove client side validation of well-known Options

[nvborisenko]

SeleniumHQ/selenium#16120

[KazuCocoa]

Thank you for letting us know.

Note:

dotnet-client/src/Appium.Net/Appium/AppiumOptions.cs

Lines 96 to 99 in c0b4fb1

	public override void AddAdditionalOption(string optionName, object optionValue)
	{
	throw new NotImplementedException("Use the AddAdditionalAppiumOption method for adding additional options");
	}