The purpose of hair inside your ear is to protect your eardrums and ears from any damage from outside harmful particles or anything else that is or could be harmful to your ears.
The purpose of ear hair is it helps to prevent germs, bacteria, and debris from getting inside your inner ear which could cause damage or an ear infection.
So you can trim the ear hair if you hate the ear hair and you'll be okay but the ear hair is better to stay inside your ear because that's the reason it grows there.
Earwax also acts as a protective barrier to your inner ear so only remove the old ear wax and let some earwax stay inside your ear for protection.