Why is it surprising that people are less productive without their tools of choice? Why does it matter how they perform on a whiteboard without Google or compil

Why is it surprising that people are less productive without their tools of choice? Why does it matter how they perform on a whiteboard without Google or compiler feedback? Is this how you work on a daily basis? We set up all these artificial handicaps and are then surprised people do badly in interviews. Just let them code using their own machine and IDE, and any other tool they need. I wonder if you'll also scoff when people start asking for Copilot or GPT.