use Robin by default and remove FSI region

[keiyamamo]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.66%. Comparing base (195f5bc) to head (b95337f).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
- Coverage   82.00%   81.66%   -0.35%     
==========================================
  Files          32       32              
  Lines        4013     3954      -59     
==========================================
- Hits         3291     3229      -62     
- Misses        722      725       +3     

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