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Combine that with the fact that large corporations constantly find ways to avoid paying taxes and its hard to be positive about this kind of thing.
The biggest challenge I've had in welding aluminum as a hobbyist is that I rarely know what aluminum alloy I'm working with. Most things don't say what type so we're left guessing what filler is appropriate. If you use the wrong filler it could be prone to cracking again in the future.
Also for thicker aluminum preheating is very important. The aluminum transfers heat away very quickly so you get cold lumpy welds if you don't have both parts pretty hot at the start.
I can honestly say I've never wondered that. It's so oddly specific lol.