An entryway mirror can support a final appearance check and spread light, but its reflection, mounting, projection, and relationship to the front door need testing.
Quick answer
There is no universal need to remove a mirror facing an entrance; adjust it when it confuses the route, exposes privacy, creates glare, or cannot be mounted safely.
Review the reflection from outside and inside
Check what visitors see when the door opens and what residents see at night. Reflected clutter or a bright lamp may be solved at the source.
Keep the door and passage clear
A frame should not be struck by the door, coats, or parcels. Heavy mirrors require fixings suited to the wall and enough edge clearance.
Use angle before replacement
A small shift can reflect useful light or artwork instead of a bathroom, stair, or busy street. Judge the practical result rather than a claim that the mirror sends luck away.
Boundary: Feng shui is a cultural and design perspective. It cannot guarantee health, wealth, relationships, safety, or other outcomes. Use qualified professional advice for building, electrical, plumbing, fire-safety, accessibility, horticultural, or medical questions.