You can still load your iPhones, iPads, or iPod touches with MP3s or any other file format of music you have on your computer. Who told you that you couldn't? It's easy.
Nor is everything Apple "smugness" and "proprietary" as you claim. That is the voice of someone who doesn't use a Mac and really doesn't know what they are talking about except from listening to other people who do not know what they are talking about. A Mac can use far more software than any Windows machine, including all Windows software, Mad, UNIX, Linux, and many other operating systems' software. My main Mac has eight different operating systems on it that I have actually had running simultaneously.
I've told you this before, yet you continue spouting your ignorance about proprietary and smugness claims. You do so because you have a bias you cannot let go of because you don't know anything at all about Macs. . . or other Apple products, as an example your question about MP3s and your implied disability of Apple products to handle them. You've been told this before too.
How long since you’ve been able to drag and drop onto an iPod?