Creating workouts

I was surprised that Garmin hadn't added some Cycling workouts onto Connect prior to the move. I'd assumed they'd at least move the existing workouts across too..

You can set a Watts target though. Target Type = Custom Power,  

Totally agree. Where is slope workout !!! ???

I also miss the visualization and graphic edition of the workout.

What is that power interval? Earlier we defined just a single power in a period of time.

I'm not sure I understand your question. You can still set whatever target power number you want over any duration that you want. Either choose a range for the power or set the upper and lower number to be the same. 

I did so, set lower=upper. 

But how is the behaviour of the trainer if I set a power interval between 150W and 200W.

Before, if I set 180W target, 180W was maintained regardless of the cadence, but now what would happen? I am away from home and cannot test.

I can live with the clumsy way Connect works for creating workouts (although the old Tacx cloud was much better for this). But what I find very hard to accept is that we cannot do a slope workout. That was a useful workout type, at least for me. It should not have disappeared. And the worst thing about it is that nobody at Tacx/Garmin is willing to admit that this is was (another) big error of judgment.