Thanks for the feedback Dorothy.
Actually, there are a lot more benefits to not having a theme options “page” as it were. The built-in customizer is a core WordPress feature that keeps things more to the core and standards of WordPress, but is a lot easier to build options using this compared to a custom theme options page. There’s also less chances of errors and compatibility issues as you update WordPress and even third party plugins each time. This is better for functionality, flexibility, and especially stability reasons. One thing to keep in mind is that once you get all your theme options setup, you won’t have to go to the customizer again (or often).