I recently switched from a Tacx to a Kickr indoor trainer. I’m mainly doing sessions synced over from Training Peaks, while listening to podcasts or watching videos. The Tacx app was good for this, with a useful display, audio count down to the next interval so I could prepare for the change in power/cadence, etc. The Wahoo app forces me to switch between screens constantly, I don’t have the audio cues, rudimentary design, feels a bit unfinished. It’s bad enough that I’m thinking about going back to the basic, noisy, wheel-on Tacx.
If you’re using TP anyway you can just use TP virtual. I might be mistaken, but I think there’s a “focus” mode that allows you to just do the workouts without the virtual world environment
If you are looking for something lightweight and mobile-friendly, TrainerDay is worth a look. It syncs perfectly with TrainingPeaks and focuses strictly on the workout data and ERG control without the heavy graphics. It’s much closer to the streamlined experience you had with the Tacx app.