Most bots on Chromium CQ now run exclusively on "chromium" recipe, making all the configurations uniform and hence easier to manage by the infra team.

ios-* bots are a notable exception - they run on a special "ios" recipe, have their own very unique set of configs, and fewer infra folks are familiar with it.

The only downside at this time is that ios builder configs are more intuitive and better organized than chromium's, and migrating it to chromium recipe may downgrade the user experience.