I wonder if this is a way to crowd out competitors. Take up so much of a candidate's time that they can only interview at a handful of places successfully. Either the candidate goes all in on you or they pass without using your resources. Kinda the grocery store shelving model of competition.
And it’s to weed out people who value their own time and who won’t take part in pointless company mandated bullshit.
If someone sits though 6 hours of interviews and pointless exercises that should instead be solved by consulting the documentation, they will probably just do what they are told without fuss, will work overtime for free and will let the company walk all over them with regards to sick pay, holidays, etc.
