I've just been playing without them, and IMO, they're not necessary. They don't make it an easier to follow the slider, they just add unnecassary clutter. Sliders seem stangely naked at first, but after playing for a few minutes I find it's much nicer without them appearing from nowhere. So if you don't already, have a go without them, and test if you like it or not. Just make sure that your skin has a visible thing that travels in the middle of the slider body.
guide:
-go to your skin folder, insider the osu! folder
-find the slider follow circle file, remove it or rename it
-find a invisible picture file, copy it into your skin folder and rename it 'sliderfollowcircle' (or whatever its name was)
guide:
-go to your skin folder, insider the osu! folder
-find the slider follow circle file, remove it or rename it
-find a invisible picture file, copy it into your skin folder and rename it 'sliderfollowcircle' (or whatever its name was)