Updating my package for v10. Is it weird that the extensions provided by UmbracoBuilderExtensions are all nullable by default? e.g.

csharp
builder.PropertyValueConverters()?.Append<MyClass>();

My package assumes that the

IUmbracoBuilder.PropertyValueConverterCollectionBuilder

exists (why wouldn't it?). I don't want to make everything nullable as, in this case, if

IUmbracoBuilder.PropertyValueConverterCollectionBuilder

is null then something bad has happened and my package won't work... so at the moment I have this:

csharp
var collectionBuilder = builder.PropertyValueConverters();
if (collectionBuilder is null)
{
  throw new NullReferenceException("The IUmbracoBuilder must have a PropertyValueConverterCollectionBuilder");
}

My question is: Should it really be my package's responsibility to handle cases where PropertyValueConverterCollectionBuilder is null? (fine if it is, but it seems like this is something pretty core to Umbraco, and should really be guaranteed to exist in the APIs that I'm using).