My 1995 Trek 520 came with STI shifters, which was blasphemy in the touring world - not field fixable, etc. Trek quickly went back to bar end shifters on the 520, still has them today.

But, I loved STI and in 20+ years had one problem with the front (left side in the US) shifter not moving. A good soak in WD40 cured that, never had a problem on the rear shifter. I'd never go back to having to remove my hands from the bars to shift