Why is the default for 'Create Raft' set to 0.6 mm?

For me, and what I have read in other posts, is not even acknowledged by the print.
For me, it was trying to print, well, about 1mm above the raft with all Default settings for printing otherwise.
Others seemed to identify the same thing with older versions as well.

Is there a way to convey to MatterControl developers to set the default Create Raft to 0.1 mm to allow an adequate result? (without the print head floating above the raft)

For anyone else who uses Raft, I would like to hear some feedback as to what settings you are using and why. If you are not using 0.6, why is not the default 0.6? Is this based on other printers expected defaults and print function?

I am using the ROBO R1+.

Thanks