A full day interview is standard. You grant that it's standard, right in the first sentence of your post. But you'll tell anyone who offers you a standard interview to take a hike?

This is symptomatic of a broader problem with HN comment threads on "how to interview" articles: for any given approach to interviewing, the top comment will be a middle-brow dismissal saying, "I would never interview at a place that interviewed that way." For all X.

I would never interview at a place that does whiteboarding. I would never interview at a place that gave me a take-home assignment. I would never interview at a place that asked me to pair-program on a real assignment during the interview (I should get paid for that). I would never interview at a place that asked me to work as contract-to-hire. I would never interview at a place that used HackerRank. I would never interview at a place that looks at Github profiles. I would never interview with a recruiting firm. I would never interview if contacted by a recruiter (instead of the hiring manager).

And apparently some people would refuse to interview at a place that asked you to talk to half a dozen of your potential teammates before offering you the job.

There's just no good approach.