Why are there so many Noto Sans fonts? [closed]

$ ls -1 /usr/share/fonts/noto/NotoSans*.ttf | wc -l                                                                                                                                                                          418

Some examples:

• Noto Kufi Arabic Thin
• Noto Kufi Arabic Black
• Noto Sans Cherokee Black
• Noto Sans Tifinagh Hawad Regular
• Noto Serif Tibetan Bold

Why is there a font for every conceivable script when Unicode is a thing? Why are there different fonts for different type thicknesses?