Slider: 
I don’t get it, every good game has Sliders so why has Roblox not made a Class for them?
are you talking about the tween service? or something else?
if your talking about a variable slider like ones used for volume, then they most likely think it is unnecessary to make a entire new class for a feature that is easily replicable.
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I agreed that they should be added but the disadvantages are they might be very hard or limited to customize since you can’t really scale any part of them freely.
the same thing can be achieved with some bool values… wink wink
keep them constantly changing if the number’s value exceeds the chosen celling and floor of the range than it set’s the value or bool to that amount 
this does apply to math but like I displayed… this can be done 
They shouldn’t add it. There are so many things to consider that it’s much more efficient and easier to make one yourself.
You can manually script them, using GuiButtons, and some Inputs. It’s not so hard.