How easy is Zero Dawn Remastered story mode?

Hi folks. In the last couple of years, I’ve turned my 72-year-old dad into a PS5 gamer. He’s beaten, among others, TLOU1 & 2, Mass Effect 1/2/3, Uncharted Lost Legacy, Control, and is finishing Alan Wake 2 as we speak. (I am a proud son.) We put him on the easiest difficulty for the above as the hand-eye coordination is still a work in a progress, but thankfully those games have generous adjustable settings.

He is interested in continuing to expand his horizons (no pun intended) and so I've been looking for an open world game, with Zero Dawn an obvious candidate. I am a little concerned though that the combat is fiddly (so many weapon types, tearing off parts, switching ammo etc.) and may prove too difficult. I don’t know if he’s going to be able to reliably hit headshots, weak points, or fast swap weapons. Can anyone tell me how generous the accessibility/difficulty affordances are? Is ammo/health more plentiful? Did they backport the cache from Forbidden West? Thanks all, any input appreciated!