Of course they focus in smaller areas as it significantly increases capacity too (providing multiple cells per sat with each their own capacity). But a more focused beam is still not able to follow borders tightly.
It's easier to focus from LEO (low earth orbit) like Starlink but there you're dealing with a constantly moving footprint. And see how small a Starlink sat is. Good luck fitting the big cantenna (and really you want several). Phased array yes but not a huge one. The more elements the tighter the focus.
With GEO (geostationary orbit) you don't have the moving problems and they do use static "cantennas" or rather dishes but you're so far away that you can't focus tightly anyway. The footprint of a single GEO cell dish is still the size of a small country.
It's easier to focus from LEO (low earth orbit) like Starlink but there you're dealing with a constantly moving footprint. And see how small a Starlink sat is. Good luck fitting the big cantenna (and really you want several). Phased array yes but not a huge one. The more elements the tighter the focus.
With GEO (geostationary orbit) you don't have the moving problems and they do use static "cantennas" or rather dishes but you're so far away that you can't focus tightly anyway. The footprint of a single GEO cell dish is still the size of a small country.