High school prepared me for college interviews. College prepared me with interview prep. Advice was to be well-groomed. Trimmed facial hair is an accepted social standard. I'd be hesitant to work for someone who judged me on that. I've had a number of great jobs in both public and private sector. None had a problem with the goatee.
As far as company research. As a new EMT graduate, I researched the company I applied for. Contacted employees. Asked questions of HR on the phone. Researched all of website. Researched the field in general. Yet, facial hair issue didn't show up.
My guess why it didn't? It's not that big of a deal. Once hired, they mentioned it in passing. I acknowledged it in passing. Moved on. More important things to discuss and judge me on than that, such as attitude, intelligence, effort (obviously dressed up, I consider myself a professional, so dressed like one), interest, commitment, references, and so on.