You will find that the relay reacts quickly to control signals, giving your prototype a responsive feel without overcomplicating the logic.
Lot of 10X O/E/N 37-9900-200 Relay Socket
You will find that the Relay Bypass Switch Kit simplifies rewiring when swapping out a relay.
A nice touch is how the relay resists minor vibration, so bench tests stay predictable even when cables get moved around.