I’m very happy with the ability to turn off the smart control of my trainer (KICKR) in Zwift, but still use the power meter readings from same trainer (via ANT+).
I found that I do prefer to turn off smart control, and set the trainer resistance (level) with the Kickr App.
In this way, I can use lower gears and produce less noise (good for my sleeping children). In addition, I do have to shift my gears much less. I found that a lot of shifting gears is a bit annoying, when training indoors. In the end, it’s just the amount of Watts produced that do matter.
I really enjoy using Zwift in workout, Ergo mode. Then, I can also use very low gears to make noise level of the trainer very low.
To conclude: Ability of setting the trainer resistance level in game mode would make the software complete to allow for individual changes of behavior of smart trainers.