DiG said:
as long as I can get my point across in a way that is easy to understand
How do you propose to do that without being able to construct sentences properly? The whole point of grammar, punctuation and spelling is to make it easier to understand!
Sure, if you don't heed most of the conventions used then perhaps your audience may still be able to understand the gist of what you're saying. They may not, however, understand the exact point you're trying to make.
Some parts may be left open to a variety of interpretations or be unclear. It will certainly be more arduous and time-consuming to read on their part - not what you're looking for if you actually want people to take notice of what you're saying.
Is it not just a common courtesy to make your writing as legible as possible for whoever might read it? Particularly in these days of the Internet, just about anyone might be reading. What if they are dyslexic and already struggle to read well-crafted writing? What if their first language isn't English? What if they just don't have the time to sift through your cryptic prattle, searching for that elusive point which you're trying to make?
Whatever that point is, it will assuredly be enhanced by good writing. That can be knowing when to use a semi-colon instead of a conjunction for effect or just producing clear prose that is a breeze to read. It's sad that you think it's a load of rubbish; I urge you to reconsider.