Building fbios takes 20 ish minutes on cold build, can be more or less; still not compatible with Buck 2. Working with objective c++ is a nightmare, and the process to switch to swift is long and low priority. Definitely not as easy as it was for Android developers to automatically have their code switched to kotlin. Data analysis is messy if you don’t set up the experiments perfectly; you end up presenting to people with incomplete data and having to come up with persuasive reasons for xyz and it’s all quite shaky and uncomfortable. No matter what you do some experiments you run will inevitably be unbalanced and then you have to start over and wait another week.
