In reply to KTS915.

I agree with every single point you make, and here's another:

7) It doesn't always load... at all! Sometimes it's just really slow.

I've used the Customizer on both WP.com & WP.org sites, with at least eight different themes, if not more. I haven't once enjoyed the experience and now I go out of my way to avoid it.

For those saying they've never heard anyone complain about the Customizer, that might be because no one was forced to use it before... I'm sure if people are forced to use it, they'll get vocal.

Frankly, I can't understand why the Customizer would be forced onto WP users. Some people want things to be easy, others want to code all their own stuff, and some fall somewhere in between. Customizer only serves the first group, imo. And I'm guessing that it's probably more loved over at WP.com, where easy is kind of the point...