[lisasays]

I don't want to hire people who implode with a bit of pressure.

The pressure of whiteboard interviews (mostly negative; of the form "yeah this problem is basically trivial, but I'm not used to coding while talking to a stranger, plus the time requirements just don't smell right and certainly do not reflect real work conditions") are so infinitely removed from ...

The pressure at real jobs (mostly positive: "the problem is somewhat non-trivial, and I know time is kind of tight; but I'm in the flow and in my preferred environment; and at least I know the requirements are legit; so can I triage some good result out of this before the end of the day?").

At least for any job one would want to have.

If this distinction is not intuitively obvious to you - or are quick to characterize any negative reaction to your interview as a matter of the candidate being basically a total limp-wrist at your craft, ready to "implode" at the slightest difficulty -- then really, you have no business constructing interview challenges for people. Not challenges with any kind of a time limit, anyway (these being generally unnecessary, when we think about it).