Well, I didn't even think to ask about this, but a friend of mine turned down their offer because they have no remote working. Like me, he didn't actually WFH that often but the lack of an option to do so occasionally was a deal-breaker for him, and it would have been massively inconvenient for me too. I ended up joining a very similar firm who were a bit more relaxed about it (who worked in C++ and Python mostly).