What’s the last instance anyone would want to defederate from? The instance which deals the most with troubleshooting technical problems. programming.dev has a lot of technical communities and also a lot of users who answer technical questions.
I also like the local experience on programming.dev. If the instance is too small, local feels empty. But, on the other hand, a lot of large instances have local feeds which are just like the all feed. I feel like programming.dev has a good balance of a distinctive yet active local feed.