This statement is completely wrong. There are millions of engineers in the world and most of them live in countries like China, India and Russia. Very few of them use MacBooks.
The vast majority of the software engineers in big companies (that employ a lot more people than big tech and startups combined) who use Java and C# also have predominately Windows laptops (as their employers can manage Windows laptops a lot easier, have agreements with vendors like Dell to buy them with a discount, have software like AV that doesn't support MacOS, etc.).
On top of that MacBooks don't have the best screens and are not the best built. Many Windows laptops have OLED screens or 4K IPS screens. There are premium Windows laptops made out of magnesium and carbon fiber.