Thanks allesad!

Yes it helped my short board windsurfing years ago when I lived in a place with no wind. It's helping my windfoling now because it takes less wind and it's warmer so I am rolling when I would not be foiling. On the heli tack it has definitatly helped. I have proven to myself on the landboard that I have got the sail flip sorted. Now when I get back on the water I am going to fearlessly focus on turning and ride height knowing that when I finally make the turn I know what to do with the sail.
Obviously falling on land is to be avoided at all costs. One of the ways I manage the risks is to keep the speeds under what I can run out, that way when things start to go pear shaped you can just step off early. It's pretty easy to get going faster than you can run though. I have some mates that jump halfway to the moon on their kites and they think I am crazy for landsailing, it's not for everyone.
Wake foiling has helped too! In the early days it really helped with ride height. Now it is improving my wave riding and pumping. I have taken my windfoil board and foil to a wake park many times. When the cable stops to turn the other way you are forced to turn a tight 180 with out any tow line tension. I started making my gybes shortly after I could make that turn at the wake park.
I have had my eye out for a beginer longboard to use for light air freestyle, that will be my next learning aid. I want to teach the basics to others with it too.
These cross training tools are fun ways to isolate and learn each part (foiling, surfing, sail handling) independantly.