You aren’t just annoying sellers when you do not follow their instructions for showing their property. You may be violating the NAR Code of Ethics.
Standard of Practice 1-16 says REALTORS® “shall not access or use, or permit or enable others to access or use, listed or managed property on terms or conditions other than those authorized by the owner or seller.”
Common complaints include agents leaving doors unlocked, accessing the property without an appointment, and allowing buyers unaccompanied access to the property.
Don’t let convenience or the end goal of selling the property distract you from your obligations to sellers. Following sellers’ instructions leads to greater trust and satisfaction with your services—and may keep you from having to deal with an ethics complaint.