This is information for IT people, and you're treating it like it's for consumers. Consumers will only ever know about Windows 10 Home. The other options are important because:
Windows 10 Enterprise costs roughly ten times as much.
Windows 10 Education is the discounted version that they sell to schools (Apple has a similar program, they just don't tell you about it.)
Windows 10 Mobile because, well...
Windows 10 Mobile Enterprise because, again, they want to make money.
Windows is one of the top 5 most profitable software products in the world. Trust that they know how to make money.
You might be right, but does Windows 10 Pro include any features that have previously been exclusive to Windows 8/8.1 Pro, such as Bitlocker and Remote Desktop? The wording of the blog post is intentionally obfuscated to not name the technologies that are added to Windows 10 Pro, but I think it's clear they are keeping Bitlocker and Remote Desktop exclusive to the Pro edition from the following:
> Windows 10 Pro helps to effectively and efficiently manage their devices and apps, protect their sensitive business data, support remote and mobile productivity scenarios...
I use Bitlocker and frequently remote from any of my Windows PCs to any of the others. So I have Windows 8.1 Pro installed on (nearly) all of them, at non-trivial cost to me.
I agree with the grandparent that for any home user, there should be one edition, and that one edition should include Bitlocker and Remote Desktop. And any other feature that home enthusiasts and evangelists are likely to want. Microsoft desperately needs to stop punishing its evangelists. Evangelists should be courted and treated well.
Windows 10 Enterprise costs roughly ten times as much.
Windows 10 Education is the discounted version that they sell to schools (Apple has a similar program, they just don't tell you about it.)
Windows 10 Mobile because, well...
Windows 10 Mobile Enterprise because, again, they want to make money.
Windows is one of the top 5 most profitable software products in the world. Trust that they know how to make money.