For a very long time now people have had the option to turn heat simulation on and off. Hardly any saves use the legacy simulation any more and I think it should be removed.
Advantages -Speed up the simulation (Less to process) -Reduce workload on creating new elements -Less code to maintain -A few more pixels on the bottom bar free'd up
Disadvantages -A very very small amount of simulations may no longer work
Hell no. Heat simulation was never part of the original game, and actually speeds the game up quite a bit just by being activated.
However, I do think that legacy mode should in general -do- more. We have dozens of new elements that have no special function in legacy mode. ^^; And honestly, things like sponge should not melt, lol.