What's the point of birth control..

Okay so right now my SO and I use condoms. We have tried no protection a long time ago and we both like it a lot more. It feels better and condoms seem to irritate me latex and non latex. We also love the feeling of finishing together:) we both are spending the rest of our lives together and I'm not worried about catching anything from him either so we are both planning to get tested, everyone says that if your on birth control you need to pair it with a condom to protect from sti/ stds.. But what if you both are in a good situation and clean and exclusive to one another and want something other than condoms? Is it truly never safe for him to be able to come inside me? If that's true, than what is the point of birth control? Is birth control just a back up method for condoms?