Maybe it solves one problem, but it has many other: https://coinpaper.com/10812/qubic-vs-monero-pr-stunt-or-proo...

Also, always remember native coinjoin.

That was fake news, please update your knowledge on the topic: https://riat.at/qubic-attack-on-xmr-monero-no-51-attack-prov...

Also, what is that problem you mention with coinjoin? Please provide details.