I'm not sure about that. Development has costs. Motion capture for example is extremely expensive, same for salaries. If you have 100 millions (and you have a fixed amount, investors are not giving you infinite money), you need to make the best out of them. When they decide how to allocate budget, managers divide those costs, say 50 millions for marketing, 50 millions for development (usually it's 50-50). Of those 50 millions 1 goes for voice acting in 10 languages, 1 goes to lady gaga (she is expensive for sure), 5 go to multiplayer R&D, beta testing, optimization... You can use gaga's million to hire 5 devs that work full time on motion capture to add several contextual animations for V and address mechanics' issues. Of course lady gaga has a direct impact on marketing and sales, so she has the priority over minor issues.You realise that game development is not about throwing a certain amount of money at a problem/issue?
I honestly don't work in the gaming industry, but if their R&D is the same as pharmaceuticals' R&D, that's exactly how it works: we need to make more compounds or tests? We ask managers for money. They do their calculations and decide how much to give or to close the project at all.
I.e. Warhorse was forced to release KCD in that ridiculous buggy state because they finished their budget and didn't have the money to pay salaries and bills. With sales' money they started working again on bug fixing and DLCs. Not great results anyway
Probably the same happened to TW3 which was finished to be fixed only by the end of august. I still remember king's gambit quest. I had to restart the game for that.