Depends on what their definition of "thorough" is - it's very standard to have architectural and design discussions pre-term sheet. However, you defer any deep

Depends on what their definition of "thorough" is - it's very standard to have architectural and design discussions pre-term sheet. However, you defer any deep dive into code or structure or "secret sauce" until a term sheet is signed and you're in the due diligence process (and typically you'll have a neutral third party due any direct code reviews).