If you’re spending a lot of time updating architecture diagrams, you likely have either way too detailed diagrams, or your software architecture is changing way too frequently. Those might be worth looking into first, before automating a lot of changes into these diagrams.
You can try our experimental BPM/Flow tool at shiftx.com/ai. Importing the AI generated flows will be possible in a few days
i saw d2lang.com which is nicer than mermaid.
but these days i iuse miro.com, smoother ux than other saas apps.