It's worth giving it a shot a second time to see if you like it. But when you do, it normally and fully is for yourself - people who want that unlimited access and freedom to do whatever they please within that world prefer it. If you want to share builds and get feedback, there's always screenshots and worldsharing, which at least gives you that. Your build skill will get better no matter what as long as you're building.
So all that distills into - do it if you want, but you don't have to. It might be good to have something on standby in case of, IDK, a trip where you have no internet and can't be on the server. I travel a lot so I've chosen that option. I still feel it's worth the time and effort because I enjoy what I *personally* get from playing MC. But it's been fun being where others play as well.