Article below on NSW Wavesailing forum summing up where foils complement fins for wavesailing.
But I use an Alien windfoil board with my existing wavesails instead of a wing ding to basically acheive the same objective of extending the range of conditions that I can sail in and can also get to places I wouldn't get to on my waveboard.
nswwavesailing.org/winging-vs-windsurfing/?utm_source=fb_page&utm_medium=NSW+Wavesailing+Association&utm_campaign=publer&fbclid=IwY2xjawPS4W5leHRuA2FlbQIxMABicmlkETF4cDM3WWNFdGlsS0hDeXNOc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHlhLsMYpA6Lv540BPgVoGhAItchtx6AelgaBNkYi0r7RCzDxFbJQNEUn0mol_aem_UKJcHzeHkH1oTzfCG4Nhbw