But fonts are more than just typeface vectors. For example, it's code can cause any conceivable string of characters to look different than simply rendering eac

But fonts are more than just typeface vectors. For example, it's code can cause any conceivable string of characters to look different than simply rendering each glyph immediately next to each other; sometimes it's kerning tweaks, sometimes combinations get replaced with completely different glyphs (like "f" and "i" next to each other often having an undotted "i": look closely at "fi" depending on the font).