It doesn't have to be equivalent, but it can't be entirely one-sided either. Two technicals are a major commitment. Even if we assume the nominal 4 hours, there's still lots of preparation that goes into taking those tests. And that's 4+ hours to get to speak to a human being assuming you pass. Otherwise, it's the "We appreciate your time," autoreply.

That's asking for too much upfront before the candidate can even decide if the job is a good fit. Job descriptions alone don't tell you much. That's where the phone interview comes in. It's a two-way street.