In reply to dgwyer.

What's wrong with the Customizer?

1. It looks terrible. It's ironic that it's supposed to be there to make sites look good, and yet looks as though no thought was put into its own appearance.

2. It's clunky. Can I see all the options? No, I have to click on something for a drop-down to open, then hope that this option doesn't have further sub-options.

3. I can't have more than one section open at once. So if what I wish to style impacts two or more areas, I'm supposed to keep toggling back and forth.

4. By no means everything stylable is included in the Customizer, and the options for each element are pitifully few. So I'm apparently supposed to make some adjustments with the Customizer, and then do others elsewhere. How on earth that's meant to save time or improve matters, I've yet to fathom.

5. It adds bloat. And it's getting worse. The tools already exist to make a site look good. This just adds weight. (An example, by the way, of how the mantra of "decisions, not options" is really just garbage to be trotted out whenever it happens to suit a particular developer. This is an option, not a decision.)

6. Try using it on mobile!

As you'll have gathered, these issues are inherent in the Customizer, and not specific to a particular theme.