This seems to assume that these non-technical people have the expertise to evaluate LLM/agent generated solutions.
The problem of this tooling is that it cannot deploy code on its own. It needs a human to take the fall when it generates errors that lose people money, break laws, cause harm, etc. Humans are supposed to be reviewing all of the code before it goes out but you’re assumption is that people without the skills to read code let alone deploy and run it are going to do it with agents without a human in the loop.
All those non-technical users have to do is approve that app, manage to deploy and run it themselves somehow, and wait for the security breach to lose their jobs.
I think you're underestimating (1) how bad most B2B is (from a bug and security vulnerability perspective) & (2) how little B2B companies' engineers understand about how their customers are using their products.
The frequency of mind-bogglingly stupid 1+1=3 errors (where 1+1 is a specific well-known problem in a business domain and 3 is the known answer) cuts against your 'professional SaaS can do it better' argument.
And to be clear: I'm talking about 'outsourced dev to lowest-cost resources' B2B SaaS, not 'have a team of shit-hot developers' SaaS.
The former of which, sadly, comprises the bulk of the industry. Especially after PE acquisition of products.
Furthermore, I'm not convinced that coding LLMs + scanning aren't capable of surpassing the average developer in code security. Especially since it's a brute force problem: 'ensure there's no gap by meticulously checking each of 500 things.'
Auto code scanning for security hasn't been a significant area of investment because the benefits are nebulous. If you already must have human developers writing code, then why not have them also review it?
In contrast, scanning being a requirement to enabling fast-path citizen-developer LLM app creation changes the value proposition (and thus incentive to build good, quality products).
It's been mentioned in other threads, but Fire/Supabase-style 'bolt-on security-critical components' is the short term solution I'd expect to evolve. There's no reason from-scratch auth / object storage / RBAC needs to be built most of the time.