"Open banking" won't do the work for you. The work of paying attention to your finances and keeping your spending under control. HoneyMoney tries to help with that.
Why? If YNAB works perfectly for you, then no need to change anything. HoneyMoney is a different beast, you can check comparison here: https://honeymoney.io/en/compare
Eh, I'm a grouch. It's so happy, carefree, cute and just straight up adorable I found it to be unprofessional. But. Everyone here likes it for the larger part. That's how I frame the website, you could almost disregard my opinion.
It's clear to see that the happy, carefree and cute design is what you were going for and you've nailed it! :)