The problem is not that other manufacturers offer choices – the problem is that for a typical consumer it’s IMPOSSIBLE to really understand which computer in the lineup is appropriate for their needs. It seems most of them are focused on B2B sales.
Of course, if you are a gamer or a nerd like myself, you don’t mind spending a week finding the perfect computer. But that’s an exception.
A dozen SKUs to describe the same hardware isn't real choice. It's the illusion of choice so a sales rep can offer a "deal" the buyer can't meaningfully compare to other SKUs. They're all machines out of an ODM's catalog with the "manufacture" logo pasted on.