Samsung Galaxy S phones have a handicap of being very low ram: 4gb
In oneplus 3/3T you can just tap the icon and the app is already loaded, "its kept in the ram", there's enough ram to keep all these apps open in the background.
In samsung galaxy s7, i got only one app open, and… When i tap that icon, it starts loading the app… This effing phone can't even keep one app open…
Read more: Can you prioritize apps in Samsung Galaxy S7?