Those things don't have to be work in the sense we mean it today.

i think the word "work" is overloaded with two meaning - one being the regular meaning of doing work (for a wage/price). The other one being to exert oneself.

People _do_ find meaning in exerting oneself, but only for a purpose which is not merely sustenance. For example, intrinsically valuable work like artistic pursuits is work, but would still be done in the event of post-scarcity.