For every single key in a piano, there are dozens of parts working behind the scenes to produce the sound. Translate that to several thousand parts in a piano action, and you have a good reminder that tuning is not the only maintenance pianos need!
The adjustment of the mechanical workings of the action is referred to as regulation. Regulation, not tuning, is what determines the “feel” of the piano – heavy, light, bouncy, stiff, fast, slow, etc. Often, your piano playing experience may be improved dramatically by some quality action regulation. If there are a number of issues, this can be a more involved job and may be scheduled as a separate appointment from your tuning.
However, good piano technicians often will perform some limited regulation as part of a regular tuning appointment, if time allows, or may recommend some additional work that can be performed on the spot. This is particularly the case when you maintain regular tuning intervals without lapses. The less work has to be done wrestling the pitch of the piano back to where it’s supposed to be, the more attention can be given to regulating the piano so that it responds to your playing the way it should!