Given the policy, simply don't acquire stuff not written in C++, and the people working on it not in C++. Unless it's competition and you're trying to bury it or something. Otherwise it doesn't make sense buy an operation and its staff, and then change their tooling and have them rework everything.
They were a hitmaker for Sony before the acquisition. The cost of a forced transition was perceived as worth it (and probably was; Uncharted and TLOU made more money than all their previous titles put together).
