Before revision:  Such scenario-based testing (i) lacks severity guarantees, (ii) is easy for SV to game the test with intelligent driving policies  , and (iii) is inefficient in producing safety-critical instances with limited and expensive testing effort.
After revision:  Such scenario-based testing (i) lacks severity guarantees, (ii) is easy for SV to game the test with intelligent driving policies to game the test , and (iii) is inefficient in producing safety-critical instances with limited and expensive testing effort.