@Tom - Those modifications you’ve stated are in essence a total redesign of the HL
The HL was designed to meet a given functional criteria which has been met, how well it functions (Non-functional requirements) is matter of personal opinion.
My HL 12m works perfectly well for me, the option to configure the HL to open cell was part of the design remit for a kite that covers all terrains if you so desire to use that option.
It would be nice to see “tuneable speed system” as standard and not as an optional extra.
Having said that, thanks to the “Ozone Speed System Adjustment thread
viewtopic.php?f=197&t=2390593 I have made my own version which works perfectly well.
The Soul
Having read the design spec, watched many videos and read many positive reviews the Soul in my opinion is an excellent kite without question.
Designed and manufactured by Flysurfer who have been making Closed Cell Foils since 2001. Marketed for all terrains like the HL, but the Soul presents many years of accumulative knowledge in terms of design,features and functionality.
My views are from someone who has never owned or even flown a Soul/ Flysurfer kite.