My father, who is otherwise in very good health for a ~60 year old, has severely reduced kidney function from taking an ibuprofen+antihistamine most days of his early life to deal with allergies.

I'll second the claim that no doctor at any point in his life had told him the risks of doing that, and many encouraged the use of ibuprofen over any other alternative (including the alternative of not using OTC painkillers every single day).

I grew up with the understanding that acetaminophen was the safe choice for fever or aches, and ibuprofen what the more potent compound for inflammation and severe pain. I recall casual anecdotes that "my doctor said 1.5x or 2x ibuprofen dose is ok when warranted" to address major incursions.

I've never once thought about taking more than the recommended dosage of acetaminophen, largely because I had no expectation that it would provide additional benefit..

In reality, I try to consume 1/2 doses of anything or nothing at all, unless it's a serious medical treatment being administered by a professional.

Well, I mean, drats. I too always assumed Ibuprofen was safer than Acetaminophen; not the least because of massively oversimplificatic "reduced inflammation - GOOD!" 'Logic'. I'm 47 now and have probably preferred ibuprofen for last 27 or so.