SOLVED: MacBook Pro 16" in clamshell mode is HOT & NOISY with a 1440p external monitor!

TLDR: My 2019 Macbook Pro 16" 5300M gets hot and noisy when connected to a 2560x1440p60 monitor, even when idle and the lid is closed. This article outlines a partial solution that enables silent operation.

This Medium article itself has gotten 45K+ views, 300+ upvotes/comments on Hacker News, and 450+ upvotes on Reddit, and many comments confirming that this solution worked for other people.