Like their games aren't . One of the main reason why their games are the mosty buggy games around is their engine . One the main reasons to build a new one is to lower the number of bugs . There are better reasons to gen a new engine than just because , like better lighting , better graphics in general , better animations , better fucking everything .
It's like having a car and you want to enter a racing competition . First year everything is great , second year you start to modify some aspects of the car because you can't compete with the same setup . Eventually as years go by you will start to change/improve/modify and add new tech to the car until you will eventually need to ditch the car for a new one because no matter what you add you can't win . Tech goes forward so should bethesda , everything has its limits and no matter how much you optimize it , it will eventually hit it's potential , when that time comes you change it for something with better potential . The reasons why not to change an engine are purely based on budget and time to learn the new tech. Building a new engine costs a lot of money , but seeing as it's not as they lack the budget I find it difficult to understand why they don't . The only explanation is that they are too confortable to using the same old engine and don't want to jump ship to a new one and spend time to a new work bench , which is a shame because with some time and effort they could easily maximise the experience of their games .
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Yes they do , they have said so themselves . At the begining they said that source engine would be an iterative engine that would never leave and simply keep evolving , but it seems that they couldn't hold that promise . They actually are building a new engine from the ground up for quite some time now which should be almost finished , Source 2 . First game released with that was the beta of Dota 2 "Reborn" released 17 june this year . And source was released in 2004 . Gamebryo has been around for more time . Creation Engine is simply an updated and rebranded version of the Gamebryo engine .
if it's fallout it doesn't mean it's autoamticly good, unless it's fallout 1&2 ofc 
