The problem is that the Command key is also used to do some things that the Alt key isn't on Windows, and there's no way to separate them or rebind the shortcuts (anymore).
Not to mention that you can't remap arbitrary keys in OS X without using third-party software, most of which you have to pay for.
Not that I mind paying for software, but I do mind paying for basic functionality that was present in the last version of the OS.
Is the complaint here that Mac OS (any version) isn't Windows?
The alt key on Windows doesn't do the same things the command key does in Mac OS, because they are different operating systems. What an utterly vacuous point.
Not to mention that you can't remap arbitrary keys in OS X without using third-party software, most of which you have to pay for.
Not that I mind paying for software, but I do mind paying for basic functionality that was present in the last version of the OS.