The possibility of Dual App in IOS

To all whom see this post, I am a loyalty user of iPhone over decade; however I start to use an Android phone 2 years ago due to the Android allow the Dual App at the same time. I just wonder this is a function which was created years on Android, and why there is no news about IOS will allow it for such a long time? Due to my needs of work and personal life, I have to use same app with 2 different accounts at the same time to catch up everything. Under this situation, an Android phone fills my needs perfectly. But I still wanna say the IOS is a great、amazing system and I really wanna get back to iPhone. But I have no idea why Apple doesn't make this change especially it seems not a big change. Will this function finally come into IOS soon or later?