Yes, the structure is very different and having them both in one app would probably also make it confusing to users if views for the same like an "album view" look different just by clicking on different cover art associated with either Apple Music, or Apple Music Classical.
> because from their other products, they seem to be a company that believes in taking their time and delaying releases till they are done to a level that they deem satisfactory
This is definitely not the case for a long time already. Some people would probably say "Since Snow Leopard". If you use the Apple Music app on macOS, or really any recent macOS apps that was ported from iPadOS to macOS it's obvious that this is not true anymore. System Settings would be another such example.
> because from their other products, they seem to be a company that believes in taking their time and delaying releases till they are done to a level that they deem satisfactory
This is definitely not the case for a long time already. Some people would probably say "Since Snow Leopard". If you use the Apple Music app on macOS, or really any recent macOS apps that was ported from iPadOS to macOS it's obvious that this is not true anymore. System Settings would be another such example.