While I agree to an extent with the rest of your post, guitar tab doesn't tell you where to put your fingers, it tells you what notes to play, just like standard notation. See below for a screenshot from a post I made on a different thread:
Both of the notation types above are displaying a combination of D# and E notes and neither is saying you must use your index finger for this note or your ring finger for another.
I am of the opinion that guitar tab is a very useful tool that shouldn't be relied on to the detriment of others but at the same time should not be dismissed incorrectly.
Your example indirectly highlight the problems with tab, though tab is useful, especially for beginners:
1. The tab contains no information about note duration. You have to read the standard notation to get that. If you have to start adding note duration notation to tab, you're halfway to standard notation anyway.
2. The tab may not be dictating which particular finger to use, but it is dictating which fret and which string to use; the beginner following the tab is also completely unaware of what note he or she is playing. It's better to give the pitch value and let the player decide where to play it, as standard notation does. At the same time, editorial suggestions of position are usually added with standard notation, and frequently suggestions for fingers to use on the fretting hand, and even occasionally suggestions for fingers to use on the plucking hand. If you don't like these suggestions, it's quite easy to write over them and modify them, since you don't have to move the note on the stave. Modifying tab can be messy, since you have to change the fret number and the string line it's on, and continue doing so on until the end of the sequence you wish to change.
The main disadvantage of standard notation for guitar music is obvious though: it takes a lot of practice to master it, since you have to learn where all the notes are. However, this is obviously a good thing if you're trying to master an instrument.
I do remember learning to read music on the guitar, and dreading the six-note chord in seventh position coming down the stave towards me!