Dr Brown bottles..

I've been using dr brown bottles since birth and I love them, I feel they actually did reduce the gas and helped but it's a lot to wash and sterilize. My son is now almost 8months burps on his own and sits up now so I don't see the purpose of them and I'm tired of washing those things if you use them you know ANNOYING! It's 4 parts to wash and it's taking up a lot of space also lol. I've tried to use without the vent but they leak 😩 Has anyone been in the same situation or switched to a bottle that was similar and your LO likes? When I tried switching he didn't like the nipple. Any recommendations on which bottles I should use?