They do their best but they can't seal away everything. Raw materials have to enter, chips and waste come out, and the whole thing comes apart for maintenance.

They do their best but they can't seal away everything. Raw materials have to enter, chips and waste come out, and the whole thing comes apart for maintenance. Manufacturing is a game of yields and margins. When you have thousands of operations and inputs, small changes have big effects. TSMC and Intel both have access to the same machines, it's what they're doing with them that differs.