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From a practical and political perspective, choosing an extended enterprise LMS independent of HR or L&D is often easier than pursuing a one-LMS-for-all solution.
Adobe wisely assumes that potential customers need a successful 30-day trial to seriously consider a purchase and "self-service" setup tutorials are essential to a strong start.
Organizations continue to purchase standalone LMS systems every day and rarely consider more than one HR or talent suite LMS products as the starting point.
A common value proposition you will hear from your employee LMS provider is that there are economies of scale in licensing, maintenance and implementation, so from a cost standpoint, it makes sense to expand the existing LMS to external audiences.