I have an old Airco Oxy/ Mapp welding torch, that takes a full sized oxygen tank, but uses the yellow mapp tanks that are the size of camp stove propane cylinders ( interchangable, but don't cook your burgers with it ). I also have a crossover hose to use it on a 20lb tank of propane and it works good ither way.. It will cut thinner steel, heat up bolts for bending.. Actually the only reason for an oxy/ acetelene setup would be for welding, as it creates a neutral flame which will shield the weld... With an actual cutting torch, it would do a lot more

As for what shut down Acetelene production, was a fire at the only carbide plant in the country, which acetelene production needs carbide