Addon Scenery support for mesh

One thing that sort of peaves me is that many commercial addon sceneries (such as Georenders, Orcas Island etc.) don't support mesh addons. Now generally if someone likes the localized addon scenery - they'll want to enhance the surrounding terrain as well. I can't see it being that difficult to support addon mesh - it just requires the localized scenery developer to include a high resolution mesh for their area - and the data isn't all that hard to get. Anyways does anyone share my feelings that commercial addon sceneries should better support mesh files? Anyone disagree? All opinions welcome.