God knows, I don't need any more fonts.
Yes, I'm aware that for any given font name, there should be at least four separate files: regular, italic, bold, and bold italic. That said, each version of Windows includes an assortment of fonts, each version of Microsoft Office includes other fonts, and I've carried forward fonts from as far back as Windows 95 and Microsoft Office 98. On top of that, I have fonts from collections I purchased decades ago, and not too long ago I bought a collection of 7,500 fonts that are all licensed for commercial use.
But I don't have them all installed in Windows 10. Most of them reside in a Fonts directory on my external storage drive. If I need one, I can install it. But keeping too many fonts installed under Windows slows down the system, and it makes scrolling through the font list in Word too cumbersome. That's why I was rather displeased to find that LibreOffice had installed 150 fonts that I'll never have any use for (because they are all open source clones of fonts that I already have).