I am absolutely not a fan of crypto, but why would you see irreversibility as a problem? I think transaction reversibility is one of the biggest problems in modern commerce; it's completely unreasonable to be able to hand somebody some cash and then walk out, and then call your bank and say "can you cancel that" and screw the merchant over. That was one of the first things I actually liked about crypto back in 2011 or so, the notion that all transactions were final.