With digital, I could easily see what I did right after I did it (chimping) and then in more detail a few minutes later on the computer. It kept detailed notes on exposure (f-stop, ISO, shutter) as well as focal length and the camera's metering mode automatically. I've since abandoned my digital SLR to eBay and shoot almost exclusively slide film in an M6.

It would have easily taken me twice as long to learn what I now know if I had to remember to keep detailed notes in a notebook and wait several weeks to mail out the film and get it back. (I don't consider it worth mailing out one roll to develop, I prefer to spread out the shipping costs between several rolls.)

I don't see why you think adding a long delay and requiring manual meticulous notekeeping and increasing the cost per photo makes learning on analog easier, those all seem to be negative attributes.