Personally, I would rather grow it at home exactly like tomatoes, if it's herb.
Most of the action these days is in extracts and fine products for connoisseurs. Don't underestimate the semi-luxury market - the same demographic who support microbreweries and small coffee roasters like cannabis. While there will be giant mass market Wal-Weed, and also large plantations like the wine complex of Napa, there will also be a lot, lot of small growers, extractors and breeders.
What I'd like to do is to create something about refrigerator-sized which would use hydroponics to get cannabis growing as close to being a push-button operation as possible. I built a prototype a few years ago that was at least able to provide the entertainment of being able to control the lights/fans/pumps via cron job, but life hasn't worked out to be able to do that again. I do think there's a market for such things for pretty much the reasons you identify.
Secondly, I think the analogy was more about the enthusiasm a home gardener has, where tomatoes are often something they would grow. So the poster above meant that they'd rather cannabis to be regulated in the same way tomatoes are: you can grow them without regulation at your house, but if you want to sell them commercially (to stores and restaurants) then further licensing is required.
The seeds in your crop only happen if you have male plants, or a problem with hermaphrodites. Most people cull the males or use female clones. If you have a female plant, it only produces female flowers. Triggering flowering is quite simple as it only requires manipulation of photoperiod.
Growing cannabis is really not that complicated… mot only has hemp been domesticated for thousands of years, but herbal varieties have been bred like heck for decades to be easier to grow and productive especially grown indoors. Fertilizer wise, it is a lot like tomatoes, loving rich soil, drainage and nitrogen, and then switching to a bloom cycle. Overall it's a very hearty and resilient plant (weed?). It's true that doing it well takes time, money, facilities and skill, and ideally passion.
For the small, self-contained unit you described, it soubds like what people call a cabinet grow. I think there's a subreddit for that. The subterfuge aspect is less important these days, now that more people live in states where it is legal, but some still do cabinet grows for space or privacy reasons. The automatic aspect is a great idea... definitely there are vast opportunities in helping people grow their own healthy herbs.
> 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.
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.
