A lot of these environments inherit a visual presentation style (ladder logic) that comes from the pre-computer era, and that works extremely well for electrical schematics when conveying asynchronous conditional behaviors to anyone, even people without much of a math background. There's a lot of more advanced functions these days that you write in plain C code in a hierarchical block, mostly for things like motor control.
I like function block on Schneider platform for
Process control with more analog values than Boolean. It visualizes the inputs, control loop, and output nicely.
