It is this thinking which is precisely outdated. Agha and Saim are 100% #6 and #7 options only to be brought in when frontliners have a terrible day.
In past, you could get away with 2 ovs 20-22 runs from a part timer in T20. Now modern dat batters will target 20-25 runs off them in a matchup over. If a team needs 4 overs from part timers in a T20 game, they will be microtargeted to an insane level.
Remember that Sanju Samson played an ODI chase vs SA confident of delaying his charge because he felt he could get 30+ in Shamsi's last over of spin. And he nearly pulled it off. This obsession with part timers is the first thing that has to go.