Except, we all know that doesn't happen, mostly because of the state of healthcare in the USA. My brother got colon cancer, so I tried to get a colonoscopy (I'm over 50), they refused unless I saw a primary care doctor first, well the first available appointment was 6 months out. After that I got a colonoscopy appointment, another 6 months out. Ridiculous reality.
One Medical makes it easy to get tested for STDs; it's not a colonoscopy, which is a specialist procedure. Looking at my app, the next available appointment with my PCP is two days away, at which point she'll put in a lab order. I go down the hall, they draw blood, and I give them a urine sample, and a few days later I get a pdf of results in the app.
Not just for my own peace of mind, but potential partners have asked to see it in the past. Different cultures I guess. ¯\_(ツ)_/¯
I think there are plenty of problems with US healthcare, but I don't think this is one of them. Standard of care in the US is to get screened for STDs at least annually for sexually active people, and more frequently depending on your risk factors. Being on PrEP involves mandatory testing for STDs every 3 months. There are also tons of free clinics where people can get checked for STDs.