I see no difference in rolling direction - both ASDF and FDSA feels uncomfortable. Try common words - FUEL vs THEN on Dvorak. Same for me. I agree with metrics

I see no difference in rolling direction - both ASDF and FDSA feels uncomfortable. Try common words - FUEL vs THEN on Dvorak. Same for me. I agree with metrics part - as a long time Dvorak user I feel article undervalues hand alternation and victimizes middle column. For me bottom row outer keys a weak part.