it doesn't really matter if you have a lot of grammar lapses now as long as people can understand it and for as long as you try yourself to become better with each post. with practice and perseverance, you'll eventually be really good at english. it's nice that you are willing to be corrected. 😊
Steemit always aims to have good content quality. Personally, whenever I bring something in the table I want it to be the best. I understand your point though but also remember that your reader will they go back in your wall if they have issues understanding your post? Just a thought :)