The Customizer is dead. Long live the Customizer.
The Customizer is great. I’ve been working in and around it to offer site customization features to our WordPress.com users since it launched with 3.41, coinciding with when I joined Automattic on Team Custom. We’ve especially used it to build great tools as part of the Custom Design upgrade, but as we’ve pushed the boundaries of what awesomeness we can unlock for our users, certain aspects of the Customizer have started to create roadblocks for us. Some of these are addressable, and some probably aren’t.
The Customizer doesn’t work on a phone/small screen. Anyone who thinks this isn’t a dealbreaker is just wrong. The UI was designed for the desktop web. This could possibly be addressed in core, but it will require a pretty fundamental rethinking of the interface.
The Customizer can get really slow. This is partly because of its two-requests-to-load model: one for the
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