I feel like this topic comes up every single time interview processes are discussed. Lots of people complaining "that process is too onerous! How do they expect me to invest that much time! In person coding problems are worthless!" And I don't necessarily disagree with that, but I do wonder what a lot of folks then expect a good process would look like while still allowing the employer enough information to make a decision.

Oxide can obviously impose a 9 hour interview process because they're a good enough company that lots of smart, motivated people want to work there and thus good candidates are willing to endure that process. Lesser companies obviously can't impose that process because there aren't enough good candidates willing to endure it.

My main point being, different strokes for different folks. If you think that process is too long, great, find a company with a less time consuming process. But Oxide's process obviously seems to work well for them, so I think it's pointless to complain about it (note I don't really think that's what you are doing, but a bunch of reply comments certainly are).