Masonry was never “in”, no? Mozilla proposed it and were the only ones to implement it, behind a feature flag. Then WebKit proposed an alternative that was discussed at length:

https://github.com/w3c/csswg-drafts/issues/10233

People have been dragging their feet on subgrid, masonry, etc for almost a decade. I followed it pretty closely for years but stopped when it started turning into a Christopher Guest mockumentary.

Masonry or grid-lanes, who cares? I’m just glad masonry (the feature, Baseline 20XX) and subgrid (Baseline 2023) are finally here.