I'd rather have a more sparse, bare bones OS like OS4 and have the option of adding programs to do things rather than have it built into the OS.
Virtually everything you suggested there Kamelito, I'd never use, it'd be more bloat added to OS4. There's add on programs that do most of that stuff if you wanted it, and all without bloating out a trim, lean little OS. Never understood why people want things more complex than they need to be, especially when add on apps are widely available for those that really love to tweak. I like the fact my SAM boots up from cold to usable status in about 4 seconds - piling more crap onto the OS would hurt that somewhat. There's very little in the way of eye candy or added functionality that a person couldn't add themselves via a simple OS4 Depot or Aminet download, so why clutter up the core OS?
Designers taking liberties to make an OS "Modern" and doing the old "people don't know what they want, so we'll just do this and SHOW THEM what a MODERN OS IS!" has been done. Repeatedly, and it's always failed. See Windows Vista and Windows 8, lol. When you try and do everything, you end up doing nothing well.
Then again, I'm a pretty basic OS4 user. Outside of a DirOpus and CED icon on the WB screen, my desktop is bare. I even get rid of the default installed dock and just live in a CLI window. People like OS4 because of the lean simplicity, imo.
You effectively just described Windows with your "modern features list".