I have spent a lot of time benchmarking the Parametric Study of Flow Simulation. It is a huge investment which unfortunately is still not of much practical use.

because of the following three main reason, I believe ( in priority order):

1. Non of the three Parametric Study Scenario (What IF, Optimization,. Design Experiment) can optimize for the Min/Max value of the Target(s), regardless that the there is  Optimization Scenario and Design Experiment with Optimization.The term "Optimization" in those two scenario does not apply for searching the parameter(s) value which Optimize the Target(s) to achieve Min/Max value.(s)

2. Initial Conditions of the Design Points cannot be custom defined.  This add additional CPU to start each Design Point (Experiment) from default initial data.

3. A Parametric Study normally run longer than if the analysis is done out of it and need more time to complete

However no options are available to stop and continue the Study.