From what I've read so far it's less about Mythos being much better at tasks in isolation.
Security wise, it's about being able to find and chain multiple vulnerabilities to actually create viable exploits.
So I would imagine that if you were using it for regular software development you may not feel that it's that different unless used in a particular way?
There seems to be some number of people here on HN that make their money in old style cyber security that seem to be under the delusion that LLMs are just going to go away and it's going to go back to business as usual for their cash cow.
I work with a number of people in security that have come around, and while they still think LLMs are rather garbage at architecture, they see how well current models we can access now are at finding security issues. They can chain together wildly different concepts and turn them into working exploits.