That is because those debuggers use primitive technology from over 50 years ago. Use a time travel debugger in the last 20 years and you have perfect state hist

That is because those debuggers use primitive technology from over 50 years ago. Use a time travel debugger in the last 20 years and you have perfect state history of all values over all time. Print debugging only captures what you think to capture. Time travel debugging captures everything. And with a proper implementation the overhead is minor.