JCW
Journeyman Pro
I've tried both ways and found the 'just throw it all in' works best with diced beef.
My Thai Yellow Curry Chicken (w Potatoes and Carrots) has always been 'everything in together, as it coesr', even in a wok.
I seal the semi-joint of I use for the 'Sushi's' Recipe Beef I use occasionally (Sushi being the name of the Thai Restaurant and Bar I used to frequent in Tunbridge Wells when I worked there).
Like potatoes in your curry , try the Thai massaman curry , that is cooked with spuds , very nice ..............EYG