i know for myself, in all honesty, (to my everlasting shame,) tend to forget to say a brocha achrona after eating something if i am not eating it by my kitchen/diningroom table.
not ALWAYS. but very very often. i’ll only remember hours later. so i don’t think it’s so much of a problem of mentchlichkeit per se, as it is with actually making our brochos properly. or making our brochos all together. if we eat in the street you also have a problem if you leave the street to enter a reshus hayochid, which no requires one to make a new brocho. (classic example: someone grabs a danish and coffee after shacharis, makes a brocha, takes a bite/sip, then leaves shul goes outside to his car which requires him now to make a new brocha)