There are some BIS functions that could be updated to use new commands for backwards compatible optimization:

allPlayers - functions_f\a3\functions_f\Network\fn_listPlayers.sqf
pushBack - functions_f\Arrays\fn_arrayPush.sqf
append - functions_f\Arrays\fn_arrayPushStack.sqf
deleteAt - functions_f\Arrays\fn_arrayPop.sqf
sort - functions_f\Arrays\fn_sortAlphabetically.sqf
configClasses - functions_f\a3\functions_f\Configs\fn_getCfgSubClasses.sqf