On this board it looks like just a functionality/beauty thing and does not matter much. But depends on the target. While for the pads I agree, spacing can be op

On this board it looks like just a functionality/beauty thing and does not matter much. But depends on the target. While for the pads I agree, spacing can be optimised, then for the densely routed areas space is your friend. At higher frequencies (shallow skin depth) most energy is guided by the trace, but transferred in the space. Traces become bounds of transmission lines along what transverse electromagnetic waves are propagating. This is the reason why dielectric constant and dielectric loss matter a lot at higher frequencies; and why good impedance matching is needed for efficient energy transfer. EMC/EMI/RFI is mostly energy management issue.