Wow that thing about Ropes Gray.It's certainly possible but I'd expect to see that more in relatively boutique firms that have high sector specificity. For a BigLaw firm with international reach it simply makes sense to leverage capability across markets so most will have done so.
But some firms will obviously lean a certain way - when I think of Ropes, for example, their lifesci/biopharma profile jumps out at me more than general tech, at least in the UK.