some do. I have this "probud" 2 component mineral from ebay. 2x1 Liter. If you use both, you come with 11-8-16. And they advice you to take 4-5ml /Liter of each the whole grow. So you end up with 550ppm/400ppm/800ppm. Also a lot of calcium , magnesium etc. Took 3-4 weeks until my e plants had severe issues and all kinds of symptoms.
Good thing, if you know what youre doing, you only take 1 ml of each bottle and you have a great and very cheap fertilizer. used that for a few grows now and the bottles are still not empty^^
they absolutely have no idea what theyre doing.