Ubuntu is a Debian distribution that releases more often. A faster update cycle for their packages is basically their entire reason for existing.

I may be biased as a Debian user, but if Ubuntu now reacts slower than Debian this may push some people to reconsider their choice.

If we compare Debian Stable to Ubuntu LTS, it's the same update cycle.

So Ubuntu LTS is pretty much Debian Stable with some different defaults (more opinionated, for better or worse).