I know this, that wasn't the thing that doesn't make sense to me. The question is how is it easier for the 3PP to make multiple versions of something versus one version of something?
@Micah Sweet seems to think a 3PP has to create 2 versions of a product one to support 2014 and 2024 5e. And it would be easier for a 3PP to support either 5e or 6e (an completely lose on fanbase). I don't see how either of those options is better than making one 5e product that works for both 2014 & 2024 5e. If you simply call your product 5e compatible - that covers 2014 and 2024, done. Simple and easy and you get the entire 5e fanbase. I can't see how splitting DnD into 5e and 6e helps the 3PP in any way.