how would you like it if you made a typo on one of your posts and had to make a new post just to correct it
"𝕎𝕖 𝕕𝕣𝕖𝕒𝕞 𝕠𝕗 𝕒 𝕓𝕣𝕒𝕟𝕕 𝕟𝕖𝕨 𝕤𝕥𝕒𝕣𝕥, 𝕓𝕦𝕥 𝕨𝕖 𝕕𝕣𝕖𝕒𝕞 𝕚𝕟 𝕥𝕙𝕖 𝕕𝕒𝕣𝕜 𝕗𝕠𝕣 𝕥𝕙𝕖 𝕞𝕠𝕤𝕥 𝕡𝕒𝕣𝕥."
There's a preview button, and most computers can see typos in your posts BEFORE you post.
Besides, unless you could see what the previous posts looked like, it would be stupid if someone said something bad, and then edited it to look good.