I can't cite any research on boredom. But after reading some articles I realized that continuous consumption of entertaining information makes me tired and agitated. So I restricted social media and internet news only to desktop and left only messaging apps on my phone, letting myself get bored while commuting or waiting for something. While subjective and anecdotal, I can confirm that occasional boredom is good for my emotional state and intellectual performance. I kind of even enjoy the periods of boredom I have now.

Always? No. Often? Absolutely.