It really is excellent. I’m finding with YNAB, I would micro manage every detail of my money. With safe to spend, I can carve out the major expenses like rent and debt payments automatically. Basically every recurring payment and savings goal. Then you know exactly how much extra you have for miscellaneous expenses. It’s a lot less work, and has basically been on autopilot for a while. I’m worried now that micromanaging a budget would be more stressful and time-intensive.

You could do this easily with YNAB as well but only budgeting for the things you list and throwing everything else into a 'spending money' category.

But you'd be missing out on a lot of features that YNAB offers if you did this.

Being an online bank is largely unprofitable. You still have to operate the backend of a normal bank (which is costly) and you don't have the physical locations to enable the trust you need to get enough customers.