What does a touchlink do exactly? Its descriptor is far too vague.
Matrix nodes can be sculpted with many different sensations (vision, sound, touch, smell etc.).
You experience them all when visiting the node in Virtual Reality...
Most users only interact with Augmented Reality using the most basic senses (vision via imagelink (glasses for example) and sound via soundlink (earbud, headset...)).
Using a touchlink would allow you to experience the tactile information also, but they are relatively uncommon, because you can just use a sim modul for the "full simsense" AR experience.