Most pharmacies in the US will count out each pill/mL. Most insurers will not pay for more than three months at a time and so the pharmacy won't give you more than 90 days * your daily dosage.
People skip or miss doses (hey, the problem the thread topic is trying to solve) and then pharmacies will auto-fill perscriptions that should be empty. Some people are on as-needed medications that also get auto-filled. I posted some more in a sibling comment.
The most common medication is so cheap that I don't think the US pharmacy handling is worth it. And few packs I've had are more than 90 days worth of pills, with the exception of some really cheap stuff (as in $10 per pack of 100).
Picking up common prescription medication consists of me walking into a pharmacy - any pharmacy! - with my prescription, handing it to them, and telling them "one of this please". They will then immediately retrieve the pack of that medicine, ask me some questions to check for allergies etc. and hand it to me. I don't have to have the prescription sent to a specific pharmacy then wait for them to have the bottle ready and verified by a pharmacist.
Same here, with the added benefits that the prescription is digital. Also, in my go to pharmacy my wife account is linked to mine, so she can pickup my medication as soon as my call with the doctor is done.