It still is done that way, but even individual LSC (large scale change) CLs touch easily >100 files and rely very strongly on the atomicity guarantee of the monorepo.

Plus, when most people think LSCs, they think about the kind of stuff that the C++ or TS or <insert lang> team do, not someone refactoring some library used by a handful of teams, which themselves usually impact anywhere between ten to a few hundred files.