Just 60 Hz. Is there a technical limitation that prevents 5K@120 Hz?

It’s cheaper. In Japan manga volumes are about 700 yen, which is about $5 currently. No budget for color printing there. Manga is often drawn by one person who is already massively overworked just to hit serialization deadlines, so no time (nor budget for assistants) for coloring.

The House is not needed to appoint justices, but the size of the Supreme Court is set by federal law, and you need the House to change that law to go beyond nine justices.