This pretty perfectly captures what the decision has to be. You either learn to live with it and ideally enjoy it, or you move on to other projects where people take it a little more seriously.I learned to live with it. They booked a lot. I quit when I paid off my new SUV. I just couldn't take the looseness anymore, TBH.
I was in a band that lived by this "close enough" mantra. Guys were talented enough to cover for their lack of willingness to practice and actually learn parts. But every night was a worry about who was gonna screw up what. Every time the band had an opportunity to do something bigger and go to the next step the guys wouldn't take it seriously enough and the opp would bottom out. We eventually dissolved because I couldn't deal with the lack of discipline and they felt suffocated by my expectations for more precision.
OP, if you can relax and enjoy the ride then try it. I suspect you can't and that's why you wrote this. So my advice is to find another group.