You shall not round off the hair on your temples or mar the edges of your beard.
Leviticus 19:27

This verse isn't about routine haircuts or long curlicues. It's about pagan religious practices involving cutting or arranging the hair for religious purposes. The tonsure practiced by many Catholic monks is explicitly forbidden by God.

A man's beard is like a mane. It marks him as a man and the glory of God. Rejecting the form in which we were created seems to me like a rejection of God's plan and authority in our lives. I don't think this verse prohibits trimming the beard for aesthetic or hygienic reasons, nor is it meant to shame men who don't have a lot of facial hair. It's only about religious practices.

You shall stand up before the gray head and honor the face of an old man, and you shall fear your God: I am the LORD.
Leviticus 19:32

God designed hair in part to advertise status. Gray hair is a sign of someone who deserves respect. Hair on the chin is a sign of strength. Long hair is a sign of submission.