Earlier quoted context omitted.
"Standalone" is a nice feature but not a separate product category. Facebook rightly considers Sony, Microsoft, HTC as competing with Oculus.
Standalone absolutely is a separate product cateogory. It's the difference between a computer monitor and an iPad: even though they both have screens, they are different in kind. They target different market segments, have completely different software ecosystems both for end-users and developers, orders of magnitude more R&D requirements, higher switching costs, etc.
Major titles like Beat Saber or Half Life Alyx can be played on either standalone or tethered headsets. Facebook offers both under the Oculus brand and positions them together: https://www.oculus.com/compare/