To try to answer trucker's original question:
Years ago, the first thing a Dr. did was ask the patient to say "AAAH" while they held a wide thin wooden tongue depressor on the top of the patient's throat. I doubt that throats have changed much and Dr's vision has not changed. What is it that now makes it unnecessary to depress the patient's tongue or is it that seeing the throat is not necessary? Perhaps it is part of an ecological plan to spare the forests.
Maybe an emphasis on the patient's tonsils has decreased? (After all, they're the main thing exposed if the tongue is depressed by the doctor.) I suspect that most people today have managed to keep their tonsils - but it wasn't always like that. Middle-class parents (mine included), and others, once seemed almost eager to accede if the doctor said something like, 'Well, little Kenneth [or Katie, say] is old enough to have [his/her] tonsils out, so how about we book surgery for next Tuesday?' 🙄
Also, it's now better appreciated that tonsils may get infected every now and then, but that's part of their function - to protect against infection elsewhere in the body. So best not to worry too much (goes the thinking), unless the tonsils are really swollen and hindering the patient's breathing.
On the other hand, if most people have retained their tonsils these days, you might think that's a reason to spend more time examining that part of the throat. So maybe the doctor now simply has better indicators of illness - like blood tests.
But I do like your 'ecological' explanation, trucker! That could be a factor, yes!
- Ken