"bestest" CPU is not required, but with 13 inch screen you have to either make everything tiny and strain your eyes, or have only 10-15 lines of code in the screen. Also, modern websites and apps use gigantic font size and you will have like 3 paragraphs of text in one screen.

Companies have standardized on, mostly, 13” laptops with whatever accessories. But, honestly, for some people who never leave their desk, a desktop of some sort is probably a better choice— though just connecting to a server works too.