Banking/finance/Health apps, have some justifiable reasons (at least) for taking time...
A complete overhaul of those apps probably has to go thru a bunch of approvals to makes sure they meet all financial and healthcare regulations
Active Trader Pro was written in the 1990s using an ancient tool and it runs via WINE on macOS. They have developed complete iPhone and iPad apps for trading in the past decade. They could have rewritten their desktop program with about the same resources.
Think or Swim is a Java application. Java is portable and there native Apple Silicon distributions. I have a video showing you how to install Apple Silicon Java and running Think or Swim natively and I put out the first version of the video back in 2021.