So many ways to predict how this study is off in the weeds before it even got started. Doing it for something measurable like interruptions versus a fuzzy thin

So many ways to predict how this study is off in the weeds before it even got started. Doing it for something measurable like interruptions versus a fuzzy thing like "stress" would be so much easier. And then you could take action to improve things, and measure improvement. RescueTime and others hit this broadly. Anything do it more narrowly?