I doubt it's because of realtime constraints, you could probably use the NDK if you need to mostly escape the JVM. ObjectiveC/Swift are also garbage collected, so it's not like iOS is strictly realtime by default.

I think the main reason those products are available on iOS and iPadOS is because most creatives have _always_ been on Apple's products and iOS users are on average wealthier and more willing to pay for software. Also, I bet the original version of the software has been available on MacOS for a long time, so on top of having paying customer it would also make it easier to port to iOS than Android.

There's TermUX on Android, doesn't mean most phones are made for and mostly used for software development/sysadmin tasks. Sure, there are a few people that'll use their Android phone to SSH into something in a pinch, but 99% use their Android phone for social media, emails, web and youtube just like Apple iPhone users.