Decisions, Decisions
It seems like the Devs want you to alternate between Hero Academy ( summon heroes/ troops ), Alchemy Lab ( slim chance at 4* ascension item you need) and Barracks ( level troops ).
With a builder available, it only takes 10 seconds to switch between an Advanced building and a regular building.
VIP PASS will often have an idle builder especially with upgrading mine, Harpoon crafting and class nodes consuming iron ( see notes).
Lab
I need emblems ( Forge- class quest nuking ), good 4* / 5* heroes ( Hero Academy- if we are lucky) and troops ( Barracks- still missing some 4*, but summoned my last 4* blue today) more than I need 4* ascension items, so I will not be building the Alchemy Lab ( unless it produces Emblems or gems ).
Notes
Click for notes
FIN