MacOS is the perfect example: it's both easy to use and the preferred choice by many professionals.

"Hold on", you say, "professionals want options, like user-expandable RAM etc". No, that's the misconception about the concept of a "professional". Unless you are a hardware engineer, tinkering with your notebook's internals is the absolute opposite of professionalism, its either a completely misguided waste of time and money, or a perfectly fine hobby.

Real professionals get work done. Customizing their workspace is something they feel ashamed to do, because it's procrastination at best.