Im not saying there is neccesaraly a mitzva to eat more. I’m saying that we don’t generally measure mitzvos to be yotze the bare minimum and call it a day. We don’t just put Tefilin on and remove them I can’t think of one myitzva let alone a deoraisa let alone one that cones once a year that we put such an emphasis and struggle to try to fullfill and be satisfied with the bare minimum
A kezayis is the bare minimum that is called achila it is not the goal that those on a high level strive to attain. Same for eating within a kedei achilas pras. If we are struggling to finish a “kezayis” in 2 minutes and calling that the absolute bare minimum to be considered having eaten, then we are doing something wrong.
(these may in fact be 2 different points)