If its necessary, what are the benefits of doing so? Since low bpm maps usually don't have streams anyways I'm kinda wondering if its even useful at all, thoughts?
It's necessary if you have trouble on alt maps/low bpm streams (think ice angel).
It's useful for keeping acc on low bpm streams, hitting spaced low-bpm 1/4 rhythms (think alt maps and generally any map with high-spaced 1/4s).