The only difference between the retail and the e/Confirmation is that the retail service always shows an ACCEPTANCE record whereas the e/Confirmation only shows "Electronic Information Received". As I stated before, you can get an ACCEPTANCE for e/Confirmations if you give the package to your carrier and ask him to do a "Pickup" scan on the package.
«I have been able to see daily online, it had been shipped (received by the post office in my town), where it was in route, if there had been an attempted delivery, and was going out the next day to try again, and when it had been delivered»
There is no TRACKING for anything but Express Mail-- the USPS is quite clear about that. If you have interpreted the miscellaneous interim scans as tracking, you are mistaken. Packages sent to interim facilitys may or may not include scans for those locations -- it is not required and I doubt that you have such information for "every" retail package you have mailed. I have many, many e/Confirmations that show interim scans but again, they are not required.* ALL delivery activities (attempted, notice left, re-try, return) are recorded for both types of confirmations.
You may prefer to spend extra money for EXACTLY the same service but many people do not want that.
*I have e/Confirmation delivery record in front me that shows the time I gave the package to my mailman, the time it arrived at a sorting station at the destination end, and the time it was delivered (24 hours + 33 minutes total transit time).