To each their own. There's far better, less expensive options out there. People just need to be educated more about it, and not fall prey to marketing
You'll never see a commercial facility using liquid nutes...be it food or otherwise. It's not economical. It doesn't make sense to ship small amounts of nutrients in 95% water all across the globe.
You're paying for mostly water, a marketing team, and fancy packaging with a teenie bit of nutrients in it.
As farmers (because that's what we are), we should be looking at more sustainable/practical farming practices, whether that's with salts or organics. There are options.
Anywho that's my opinion on the matter.