When I had partners in my business I studied them first deeply like I was going to marry them because I WAS going to marry them!
You should agree on your values or else the company will go nowhere. One founder will raw one way and the other the opposite making the boat to stay in the same place.
I have a software company and the opposite problem: I am obsessive about testing and meta programming. We write way more testing code than code, we automate everything with meta programming.
It was clear several times that we tested and automated way more than necessary. We automated things that only used once for example(although we used later multiple times on other projects).
So we had not the usual problems than companies have like bloat or security vulnerabilities but we had the problem of having software that was was super expensive because we did double or triple the code than the competition with tests that developers hated(they are boring to write). Our software took also way more time to market.
Companies love to buy the cheapest they can today and tomorrow we will see, so that put us in a difficult position. It was specially hard at first, but then this principles gave us an edge(because most companies would compromise early and not reap the benefits later).
Had I a business partner with a different mindset and beliefs, it would have been impossible to me not to change course of the boat in hard times.
BTW we use LLMs with great success. It let's us test even more spending way less than before.