Why are people downvoting this? I’ve literally never seen anyone use a thermometer to cook a burger or steak or pork chop. A whole roasted turkey, sure.
For whole meats, it's usually safe to be rare and you can tell that by feel, though a thermometer is still useful if you aren't a skilled cook or you are cooking to a doneness you aren't familiar with.
Those are thin enough I wouldn't think to stick a thermometer in them... it would be too hard to get it in the center and not out the other side, and it's pretty easy to get a sense of doneness from the outside (or cut into one and see). Steaks, depending on who's eating and doneness preferences, thermometer is nice. Roasts, almost certainly.
i havent heard it for burgers, but steaks for sure.