Why transformers rather than switch mode power supplies?

Hi,

I am currently looking for my first low to mid range soldering stations (recommendations welcome). And every teardown I see of Hakko, Weller, Atten, Circuit Specialist, Ersa and any other, they all have 110/220V to 24V transformers. Why? Wouldn’t it make much more sense to use DC-DC converters, as they would be smaller, more efficient, lighter and cheaper (which is comprehensively explained by this SMPS fundamentals: http://www.apogeeweb.net/article/85.html )? especially for the > 60W range.