The reason there's posting restrictions like the 1000 character limit is because the Beta forum degenerated into a wretched hive of flaming and troll posts (SE implemented the same restrictions on the Beta forum) - no doubt that spooked them so hence they just kept the restrictions on the Lodestone.

Yes it's annoying, but the 1000 character thing is easily worked around (post the first section of your post under that limit, then simply edit in the rest), and the amount of posts you can make each day increases with your character's level - it's to stop new players coming on and making endless 'hello world!' type spam threads/posts. Or at least, that's what it seems to me.

SE are only responding to community behaviour - if people didn't troll or post spam so much we wouldn't have this problem - it's a case of 'this is why we can't have nice things.'