Yes. Generally speaking, you want your pilots as proficient as possible on a single type. They will need many hundreds of hours on the new type before they are

Yes. Generally speaking, you want your pilots as proficient as possible on a single type. They will need many hundreds of hours on the new type before they are considered seasoned. A lot of disasters in the last 30 years have been amplified by pilots with low hours on the type they were flying. It takes a lot of training to memorize checklists, switches, levers, time to get muscle memory for various emergency situations. It’s a lot of time in the simulators. Lots of airlines also fly only one type, so they are majorly impacted by needing training for their entire pilot crew. It’s their own fault for choosing that but still. Combine this with the fact that airlines are razor thin margins and always seem a couple bad quarters away from bankruptcy and you get what we have today.