It has been a few years since we covered Google updating their site move recommendations document but they have. They basically now give different advice when moving a site based on if the site is a big/large site or small site.

The new document has a new section for small or medium sites versus large sites. It reads:

Small or medium sites: We recommend moving all URLs on your site simultaneously instead of moving one section at a time. This helps users interact with the site better in its new form, and helps our algorithms detect the site move and update our index faster.
Large sites: You can choose to move larger sites one section at a time. This can make it easier to monitor, detect, and fix problems faster.

It makes it sound like you can 100% move your large site all at once, but to monitor issues before they become major issues – Google does recommend you move chunks of the site instead of the whole large site at once.

This was spotted by Jammer on Twitter.

Forum discussion at Twitter.