Product should make sure to create an MVP aka the fastest solution for A-B.
Code should be done right no matter what, you’re being paid as an expert to do that, if they would want whatever crappy code gets it done they would do it themselves with some nocode solution and test the hypothesis.
As I've written in a recent thread... that may be the case in the academic world, but certainly not in the business world, where time-to-market and profitability always trump code quality if not explicitly required / audited by client contracts.
Computations along novel curved beam configurations have to be correct, 400 m deep billion dollar / annum mine stope angles need to be both aggressive and safe, et al.
Often there's not as much competition as might be in other domains, and while profitability pays the bills the real onus is on the production of provably correct software (to the greatest degree practical).
What actually happens is more like :
"deliver as fast a possible, no matter what"
...
"The poc was delivered in a week, why are new features so slow? And can you explain what this refactoring item adds to the bottom line?"
The answer is very simple: you don't.