What you say is accurate, but I feel like it sort of highlights the difference between cannabis and tomatoes. Cannabis is not difficult to grow; even a modest amount of care and attention can produce good sinsemilla. Tomatoes just seem to set a pretty low bar for effort, I think.

> but herbal varieties have been bred like heck for decades to be easier to grow and productive especially grown indoors.

This is probably what I would consider to be one of the key differences. Because of prohibition, there was a great deal of what we might almost call scientific research into maximizing yields. A tomato is pretty much a tomato any way you slice it, but the hemp growing on the roadside and the product of the expert grower are hardly recognizable as being from the same plant. I don't think humans have quite the same relationship with very many other crops.

I think the main appeal of an automated grow cabinet would be that it's relatively difficult to keep temp/humidity/CO2 at ideal levels without a fair amount of investment in HVAC. Monitoring TDS and pH is almost too easy not to do, and being able to adjust those automatically is probably trickier than it sounds, but tractable. Setting up truly ideal conditions for cannabis cultivation requires a lot of planning, and dedicated space. But as you say, this isn't very different from the home/small batch brewing scene, and there should be a similar market for equipment.

Last time I encountered this on the network, the hot thing was self-contained 55-gallon plastic drums, with integrated thermal signature hiding and odor control. You plug it in, add water and hydroponics chemicals, and mostly leave it alone until ready for harvest. But at the time I saw it, the electronic control systems were largely do-it-yourself, rather than turnkey, off-the-shelf control units.

By this time, there should probably be a package targeted for Raspberry Pis, and the ability for your cannabis plant to text you via Signal if she wants some attention.