Scientific evidence that lobsters can experience pain has led several countries to update their animal welfare legislation. The UK, Switzerland, and New Zealand now legally protect lobsters.
Live boiling is a slow death — lobsters take 35-45 seconds to die and show vigorous escape behaviors. Electrostunning (as used by CrustaStun devices) renders them insensible in under a second. The welfare cost of continuing to boil lobsters alive when humane alternatives exist is difficult to justify given the evidence for their sentience.