Hi
I've only just recently changed to Affinity photo - and like it a lot so far! - but I am dearly missing HSL correct in the Develop Persona too.
Seconding malogrand, it doesn't really matter if it makes sense technically, but for the workflow it makes heaps of sense.
Alone to be able to save all adjustments in one preset in one environment saves plenty of time if you work on a larger set of images.
Additionally if you adjust curves and white-balance then you would want to work on specific colors in the same session. Not having to go forth and back between Photo and Develop Persona.
In any case, thumbs up for the great piece of software!