This will strengthen the Customizer and, as the Customizer gets better and better I will use it more and more.

Most sites want a logo first thing. If this isn't something that shouldn't be part of Core I don't know what exceeds it.

Ask the question, "What are the items most sites want to customize?" Logos are at the top of that list for sure. Site icons (favicons) are up towards the top of the list too. Fonts, colors, layout, etc.

So sure Site Logos should have been the FIRST thing added to Customizer.