It's because brands that have that setting didn't design the light. They were walking around at some foreign show with a badge hanging around their neck, saw a light they thought they could do well with under their own brand, asked for the quantity they needed to make it their color and packaging and placed a PO.
Cheap direct ship brands on Amazon it's to be expected, but you'll also find it from well known brands that just have no engineering team or lights are just not their bread and butter. They buy whatever the factory has already cooked up, and that factory is trying to cast as wide a net as possible with tacticool, emergency roadside and camping/outdoors brands included.
If a brand targeting automotive has a flash/strobe/SOS setting on their light they either had no hand its design or don't know their customer, in either case you can assume they are also not thinking about chemical resistance on the materials, charge cycles you'll get out of the cell, and often simple things like charge rate or even double checking the lumens the factory told them is anywhere near accurate to the standard.
