The cars that use assists in real life use them for a reason. For example in a GT3 car in pCars you will lock up over every bump and most slow zones if you try to brake late. You can brake much later with ABS. In theory you should be able to brake just as late without ABS via threshold braking, but theory doesn't always translate to reality. On the flip side of ABS, the FA rarely locks up when ABS is off. It just depends on car design and what the car is designed to do.
GT3 - ABS TCS
GT4 - ABS TCS Stability Control
The easiest way I've found to enforce this is turn all assists off and turn real assists on in the lobby.
The comment I made about online lacking options doesn't really apply that much to our series. It's more of an online public lobby issue.