They schedule all of your interviews at once, and you'll have several (5+ at a minimum) some of which aren't on your team. They say it's because they prioritize cultural fit, but that just says lack of trust. Additionally, by doing this, if the first interview doesn't go well, prepare to waste your time, and theirs, for the other many conversations.
It also is a heavy veil to what's actually important to them: skills. They'll sandwich that conversation to make the cultural thing act as what's most important to them. So when you get your schedule, make sure you identify that one because it's the one that is most important to them.
If you're cool speaking with more than 3 people for a job, go right on ahead and interview with them. But remember it's as much you sussing out them as they are you.