Real Estate Agents and Builders to stop using the terms “master bedroom” and “master bathroom”

Let me ask this:
When you "master" a skill then what are you going to call it now?

Postmaster
Quartermaster
Masterpiece
Mastermind
Harbor master
Scout master
Masterful
Shopmaster
Webmaster

None of these words have anything at all to do with slavery.

That's why nobody is calling for the words in your list to be renamed. Master has multiple definitions. "Master" as in to perfect a craft has no roots in slavery. "Master" as in the master of the house and the master bedroom (vs. the servants' quarters) has roots in slavery.