What if we construct the brains of the operation but leave out the safety analysis circuitry?

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Consider a neutralization system with the piping and instrumentation diagram (P & ID) in the figure below, where a certain amount of solution is added to a tank chemically treated and then sent out to the next tank. The sensors ts & as are used to sense the temperature and PH of neutralized solution, respectively. The level switches (Is1, Is2, and Is3) are activated whenever the level in the tank is at or above a given level. The neutralization process is to proceed as follows: 1. Initially, all the valves are closed, the mixer (m) and heater (h) are OFF, and the reaction tank is empty. 2. When the START button is pressed, open (V1) until (1s2) is activated. This fills the tank with the solution to be neutralized. 3. When the solution level rises above (Is2), start the mixer (m) and turn on the heater (h). When the level drops below (Is1), stop the mixer (m). 4. Whenever the PH of the solution is unbalanced, open (V2) to add neutralizer. 5. If the tank becomes full, which is indicated…

Which logic diagrams are better to be used for large complex projects?