Some thoughts on this, and experience:
Extreme personal differences whether you like a kite with powerspike, or a "soft" kite, but also depending on you and your gear what you typical will like IMO.
Both have their advantages, with a powerspike you got a lot more range, both highend and foil lowend, and you can accelerate all of a sudden when needed.
With a soft kite, it turns a lot faster and better, and you can pleasantly loop it around whenever you want, without getting yanked, and everything is smooth and easy, also a huge advantage and feels good.
Another advantage is when you gain speed, you dont get overpowered out of control, but this is a double edged sword as lower AR kites might still lead to a death run, compared to higher AR ones, depending on the riders ability to edge and move the kite to the window edge.
In general, just like LEIs for waveboards or TTs, heavier riders like more powerful kites both in grunt and powerspike, and reverse, lighter riders prefer smoother kites with less grunt (more depower), even when not using the same sizes of course.
We are talking about lightwind tubes here, and these need to be 1 or no strut to be light, in order to fly in 6-8 knots.
Thus they can not be high AR, and if, they would turn like dogs also - meaning powerspike not really possible with these.
Low AR has huge advantages in terms of relaunching also.
When more wind 10 knots and up, you can use ANY kite, heavy or light, powerspike or not - another ballgame here.
Going to high AR foilkites you can get max powerspike, meaning max windrange.
But you also get a really difficult kite in light winds, as it tends to fold easy in lulls or turbulence.
Meaning a bit lower AR kite can often be better for this task - again individual preferences.
Then another parameter, is wing.
If you use a small fast wing, say a racewing or just a small wing, the powerspike in the kite is even more essential, as you need it to get foiling, and when up, the apparent wind keeps you foiling in quite light wind, cool.
But transitions can be a lot more difficult, IF you lose speed...
With big wings, or big higher AR wings, you dont need the powerspike the same way.
Here you mostly just want to be able to waterstart, thats it, and you can foil now, and use the advantages of a soft kite
So if rider is light, and uses a big wing, a smooth kite can be the best.
If rider is heavy and uses a small wing, powerspike is essential to be able to ride.
Above is probably basic knowledge for many, but maybe some can use it
Peter
PS: Jumping is not a thing that matters in this ultra light wind, right? Somewhat wrong, as hydrofoils can jump amazingly high in these winds, but here a high AR kite is required, even if it turns slower history has shown they give higher jumps, mostly because of less loss, but also because solely on hydrofoils the apparent wind angle get pinched too much if not efficient and high AR, and you can not jump high.