I think its a never ending issue
some people are

bent on "Melty Brain" being a bot type, only it isnt an official Robot Class. Its Transitional Dift FBS... I wrote that on the wiki page for this AI but then Naryar changed it to SnS which brings us to this point you just made
couldn't be accurately called Sit-n-Spinners as they don't sit still
SnS is sit and spin which is what FBS_1 and FBS_2 achieve which was the reasoning for my thoughts on them changing
Bottom line is.. the reason we have so much confusion with this bot type is that people combine the two.. real life robot types and made up ones for RA2. SnS at some point became a known bot type in RA2 but in real life there is no such thing.. no robot with a spin button to spin it around and a forward button to move when counted out, SnS is a strategy IRL that other robots use (such as 13 Black used an SnS tactic against razer yet its a HS)
but now we get to the point of do we ditch the SnS class ?
the way of difference can be quite simple imo.. just some seem to attempt to make it as complex as possible
SnS = Spins the whole robot around, sits in one place
FBS = Spins the whole robot around, has some form of movement while doing so. this usually is
- Transitional Drifting (Nicknamed Melty Brain after the robot that used this technique)
- Floating Drive (drive motors that stay in place using axles or attached to a motor, etc)
- NaviBot (not possible in RA2 but is similar to Transitional Drifting, Whyachi made this drive that quickly adjusts the angles of the drive motors back and forth to move around)