Apodizing filters don’t smooth over details. Instead they fix errors (distortion) in the high frequency area that makes many recordings sound harsh. Some may mistake the extra harshness/brightness to detail. These errors are from recording ADC digital filter, or from production chain software tools.
Keep eye on the “Apodizing” counter in HQPlayer. If it increases to figures >10 during playback, you should certainly be using an apodizing filter. If you use apodizing filter when such is not absolutely needed, there’s no harm either. But if you listen with non-apodizing filter material where the counter keeps increasing, you know you are listening to high frequency errors.