The Boros theme has been switched from "combat matters" to "artifacts" with the release of Neon Dynasty, which has also been incorporated into the cube. This will make for more interesting drafts and variety in archetypes.
With the inception of an artifact subtheme, cards that wiped away all artifacts needed to be cut, like Austere Command and Bane of Progress. We also trimmed Snuff Out, which is very uninteresting as the only free spell in the cube.
Many weaker cards and commanders have been cut to increase the level of consistency of power across the cube. Ideally, the same cards shouldn't be the last cards in the pack draft after draft, and cards/archetypes should all be about the same power level.
This is going to be a very positive change for the cube and I can't wait to test out some of these new cards!