You're aware that by law most cars after like 2015 2018 have to have a backup camera in the US right?
If it is broken they are literally breaking the law by not fixing it.
Yes, you can have your mirrors and rearview but the camera removes your blindspots that those miss (you know things like a small child that is behind your vehicle). It's a critical safety feature that is broken and needs to be fixed.
edit: NHTSA required it in 2018 not 2015, Canada probably has similar laws on the books too