We currently have 56 questions tagged communication. This strikes me as a meta-tag which has no intrinsic merit.
Do we need communication? or should it be expunged?
I would say there is a subset of questions where the question does warrant a generic communication tag (e.g. What should I use for wireless communication between an Arduino and a Raspberry Pi). In this case the more specific tags are not appropriate or limit potential answers uneccesarily.
The majority of questions are posted by users who are new to the site, the Pi and electronics, and who may not have the knowledge to better formulate or tag their question. Obviously others can edit the tags in the event a more specific tag is appropriate, but as the previous example makes clear there may be no better tag, and this could lead to two problems a user giving up because they do not know how to tag their question, or more likely, the user choosing the most generic tag such as Pi foundation (see discussion here What should we do to [raspberry-pi-foundation]?).