Debian packages are ancient, unless you use "testing", which will be broken. That being said, Ubuntu is horrible too. The problem comes when you have to use proprietary software made by incompetent vendors, and that only works in Ubuntu.

Ubuntu is basically a packages imported/synced from debian (I think they mostly cherry pick unstable) + ubuntu specific stuff.

Debian Testing is pretty much what many Debian users use on a daily basis. They pretty much invented the notion of rolling releases. Debian stable is of course not cut that often. Ubuntu has a higher frequency of updates. But still, their LTS releases are spaced two years apart. 26.10 follows the recent LTS 26.04 release, so that gives them a good 1.5 years to work on stabilizing this. I've been using Ubuntu server LTS releases for the last ten years or so with generally no major issues. There are always some minor headaches between updates but generally nothing that worries me.

The main criticism here seems to be that these packages need a bit more work or are still lacking certain important features. Getting them out in a non LTS release like this is how they get packages to be ready for LTS releases. If you need LTS now, 26.04 is what you should be using. By 28.04, this should be rock solid.

For me what's risky here is deviating from what other distros are doing. Including Debian. Ubuntu has a history of being opinionated not everything they push through being adopted with great enthusiasm (e.g. Snap). You could make the point here that waiting for Debian to pick this up would be nicer. But you could also make the point that waiting for that is a very slow process.