Thanks for the response, i commented on the task you mentioned.

In the context of selection based tools i would like to point out that, with the addition of the toolsystem, there are two ways of interaction in parallel. (This was already mentioned here: https://lists.blender.org/pipermail/bf-committers/2019-July/050018.html by Campbell)

While it's definitely important to be able to easily access tools i'm not sure about that solution. I don't see why it's necessary to have a whole new UI concept only to be able to do 2 things that are ment to do the same task:

1. trigger a modal operator
2. activating a tool with its gizmos