Of course, "special" kites for light wind, hydrofoiling that is, are present the last 2-3 years only, and has not really existed before - so wrong to say they have gotten "better", as you got nothing to compare to
IMO, LEI kites for waveriding, 10 m2 and below, havent changed the last years - well, okay, according to the manufacturers they are WAY better of course ha haa, but they only tweak small things and colours, and use a lot of PR to get us to think they are much better, I mean this seriously
Thats how the game has always been, and will continue - the difference is though, that earlier there could be huge differences in how good kites were made - not any more...
Differences in how they work and to what, yes, but that got nothing to do with "getting better"
The hydrofoiling scene has opened up a whole new era of LEI kites, and now lately also foil kites are aimed for non-racers, which is a plus for many non hydrofoilers too in light wind and even light wind waves
I got many kites 1 m2 spaced, and with many years between (change when one is worn out), and also ride my friends kites now and then - and IMHO I can not see much or any change the last half decade of years
Which is good for us kitesurfers