I've compared numbers and 10 second averages on gps-speedsurfing, 2019 to 2023.
Very rough description on what is typical kit is required to achieve speeds for each band:
Foiling
>30 is hero status
25-30 you need decent speed/slalom kit
20-25 freerace type kit.
>1 - 20 is people on freeride kit.
Fin
>40 you need speed kit
>35 can be done on decent slalom kit
>30 can be done on decent freerace
>25 is more freeride
In 2023 the top 3 fin sailors also posted sessions on small & medium slalom kit. 1 in top 20 posted on large slalom kit. I think the number of sessions posted on large slalom kit will have dropped a lot in recent years. But small & medium slalom kit is still in widespread use.
The brands will be doing their own analysis of kit sold, and what they want out of PWA slalom to showcase their kit. Thats why fin isnt dead, and there will be fin only events at windy spots. I hope.