Comment by softirq

No it's not, for several reasons:

1. Average users primarily use mouse based workflows.

2. Super isn't discoverable.

3. It confused users coming from other DEs.

4. It actually takes more keypresses than clicking a favorited app on a dock that is always available.

Overall it's less discoverable, less efficient, and not baked into the mind of computer users who are coming from almost any other bistro.