From what I've learned by researching them,  it's much easier for a constant load,  like a stationary generator,  and also for boilers. It's kinda funny that there's more info on how to run a car on a gasifier than a boiler, i guess because cars are safer to work on.  When stirling engine technology advances more, i have a feeling gasifiers will become more common because the tar and dust becomes much less of an issue.