A friend and I are having an interesting discussion about ligatures. Two days ago, I noticed that the banner on this page on the Apple website is missing a fi ligature in the word "find." Myriad Pro definitely has the fi ligature, but it is not used.
My friend says that ligatures are not necessary in large font sizes, such as in billboards. I thought otherwise. The ligature definitely looks a lot smoother than doing without it.
I don't remember any mention in school of not needing ligatures in billboards.
Someone suggested that perhaps the use of ligatures in large type has to do with whether it is serif or sans serif fonts are used. I can see how in a serif fonts the f and the i have more of a tendency to overlap, but I'm not exactly sure.
Any thoughts on all of this?