Is Bitcoin really a decentralized currency? How many coins can there be?
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I believe this
answer is more detailed and would probably help more (maybe my explanations are not the best, I'm not an expert ^^).
The main idea is if you create the necessity of the 75 characters, it will reduce spam (cause spamming sig campaign would become more expensive in time) and people would get used to answering in a more detailed way. Which can't be a bad thing in my opinion.
Wrong. Your answer is a straw-man. The newbie did not ask what a decentralized currency was nor how it works. He only asked 'is Bitcoin one'; that's a yes and no question that can be expanded, albeit it would be redundant in this case. Imposing a character limit will not reduce any sort of spam but would rather negatively effect users that contribute by excluding their constructive albeit short posts. Spammers would just re-write more of what others posted to get above the limit (pretty simple actually).
Wouldn't say a straw-man, more like a deduction. He asks if Bitcoin is decentralized. That means he doesn't understand how it works, because if he understood how it works he wouldn't ask if bitcoin is decentralized as it's the obvious consequence of the way it was created.
Imposing a character is the same thing as putting a captcha before the faucets. It doesn't make it impossible to farm it, but it makes it more costly to farm it in an industrial way. And let's face the truth if you take all the messages of less than 75 characters I'm pretty sure 90% of them will be spamming answers. (Though I never did any stats of that it's just an impression :3 )