[hoytech]

While I agree that sheet notation is superior, it actually is fairly common to indicate duration and articulation in tablature, especially classical. See many of the tabs on classtab.org: https://www.classtab.org/tabbing.htm#key

Surprisingly (to me), tablature is apparently older than sheet music. Tabs are also pretty nice when you're dealing with non-standard tunings.

Lastly, even with standard notation, guitar music is often "unnecessarily" annotated with numbers for left hand fingering, roman numerals for barres, "pima" for the right hand, diamonds for harmonics, etc.

[bluGill]

There are often several strings that could be usedeto play the same note. However getting the right one is important as they are not substitutable. Thus standard notation isn't enough.