Houzez is a professional WordPress theme designed for real estate agents and companies. Engage visitors and potential clients with custom Visual Composer modules, header options, different listings and property templates.
This is not a theme that only takes care of the front of a real estate business. This is also a WordPress-based property management system which allows you to own and maintain a real estate marketplace, coordinate your agents, accept submissions.
IDX integration mean theme work good with third party IDX plugins and will not crash or stop these plugins functionality if someone will use it. Furthermore the use of an IDX system is optional and it is not necessary for the functioning of the theme.
About user interface: It’s impossible to have same UI for IDX plugins as Houzez default because IDX plugins providers use iframe which not allow to change any HMTL or CSS code, also impossible to overwrite their HTML to make same GUI like Houzez default.
About searches. Theme default searches never work with IDX nor it is possible because theme searched search data from WordPress database, it is not possible to search and get data from third party IDX provider database.
Using an IDX system is not free and required monthly subscription with an IDX provider.