Is it true that we don't need checkers if we use OB2 because its same faster as checkers?

I mean both are completely in c# so is it true?

OB2 is really fast but also full of features, so it might be a bit slower than something dedicated for a specific thing. Anyways, in OB2 configs are compiled to C# code for speed. In OB1 they are interpreted, so it’s slower.