Yes Over on bicycles.SE we have 100% of questions about bicycles, so a bicycles tag is pointless there.
Every single question here is probably about drones or model aircraft. Thing is, while similar, these are not the same, so a tag might be appropriate.
Tags are for filtering, so its quite possible a user might only want to see drone things and not fixed-wing things.
Sub-question - are model helicopters on topic? and if so, are they [model-aircraft] because they are miniature versions of real aircraft designs, or [drones] because they fly by pushing air straight down?
Either way - the base of questions is in at least two distinct main categories, with at least one smaller "other" category.
Thus a tag for [drone] is quite reasonable.