A good approach is to check and compare your experimental data before and after processing to ensure no information is lost.
The 1H NMR spectrum below shows two signals at 7.34 and 7.37 ppm. At 0.2 Hz line broadening (LB), the spectrum (bottom) shows two signals as two singlets. With no line broadening, the spectrum (top) shows a signal at 7.37 ppm with splitting. The extra information from the splitting can indicate potential meta coupling or two signals overlapping, either of which can be used in characterizing the unknown.
It is common practice to apply a function to NMR data to help improve the signal-to-noise. However, it is worthwhile to note that a function does change the data and some cases can obscure some useful information.