My thoughts exactly! I hated to see the flow meter go for whatever reason, but a rain sensor and a weather station would make sense. Please focus on what you do best. If you want to sell fertilizer, start another company to do that. I’ve installed 100 + units since Gen 1; I welcomed Gen 3 because of 5 ghz linking and large wire accommodation.
When I saw the fertilizer ad, my first thought was “what the hell were they thinking?” Please get back to hardware design and production for the pros. The older software with the dial for zone and run times was very easy. Now, to reduce or increase run times, I must tap the little plus or minus to change it.
Ive also replaced some recently because of power surges or lightning damage. A more robust line interface would help, or even a Rachio surge suppressor. How about a wireless valve for those shorted lines that require endless searching. I could think of a dozen ideas for products that would enhance your product line…(other than fertilizer 
)
How about more than sixteen zones without linking the two. 24??? 36???
Please get back to your core business. There, nuf said.
Thanks,