its good for grandmas who read the news and watch youtube. its not good for photo/video editors, gamers, those who use specialised software etc

Good. Guess the post is a bit clickbait. Productivity has a thousand facets. If you can't run your software on Linux, well yes Linux is not for you. If it's about tasks like writing, calendar, making video calls, email and handle your excel sheets. You will get your stuff done. Games are not for productivity btw

How many companies is she running?

Wrong question. What's making you feel unproductive?