FWIW, I appreciate most of the changes that have made the game harder, especially the way herbs/potentials work now (though potentials are still buggy) I meant, you rarely see people oppose an idea because "it makes the game harder" as their sole reason, but often changes are resisted because "it makes the game too easy", even if those changes actually make the game *better*. In other words, I'm not looking at this from a hard/easy standpoint, but a fun/less fun. Duelists and Wizards are both pretty easy to win with, Mindcrafters and Merchants hard. I play Duelists and Mindcrafters all the time, because I think they're lots of fun. I rarely play wizards and haven't played a merchant in like 7 years, because they bore the crap out of me.
Anyway, I think being able to have more control over what skills my character can learn in-game makes it a more fun and interesting experience. I like that my ranger can learn to cast a few spells, or that my wizard can be a fighter if he wants to. I don't really think making Alertness a trainable skill for mid-level PCs will suddenly homoganise all the classes, it'll just give you more options.
Also, you completely missed my point about Dodge. Making it a trainable skill will allow you to get to 100% easily, making it much more useful, drastically improving it's usefulness and applicability. But nobody has made an issue about it because the general consenses is "Dodge sucks." But how many characters die to melee attacks vs how many die to magic?