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>> I have had to use all my (4) program slots
Same. This is infuriating. I have a 16 zone XR and it only has 4 program slots. I did not realise this on purchase otherwise I would probably have gotten a different system with the ability to run all zones individually.
There should be a program slot for each zone.
You are right about it not being an optimal way of running a pressurized system. Also if you have low or sub optimal pressure to start with you simply can’t run multiple zones at the same time in one program.
So for the only way I can run multiple zones individually is bypass the app and use Home Assistant or Hubitat to control the solenoid valves.
As you said you either need to be able to run zones at different times in a program slot or have a program slot for each zone.
This needs to be fixed in a future update.