Why gate simulation is needed even though STA (static time analysis ) is done?

There are few things which is very important now a day which leads to have gate simulation.

1 Logic designs are not fully synchronous  , for testing asynchronous design , gate level simulation models it accurately.

2. to check power up/reset operation of logic design.

3 to check x propagation testing  , if there is non availability synchronizers it may propagate X.

4 To model real glitches at the edge because of combinational design

5 to catch multicyle path in presence of such test

6 To verify if design works at the  desired frequency with actual delays in place