I'd also add: Game content is not built in a vacuum, and is built by a team of people who were trained on the engine and have a large bag of tools to help impr

I'd also add: Game content is not built in a vacuum, and is built by a team of people who were trained on the engine and have a large bag of tools to help improve performance. You can't just plug a random scene into any game engine and expect it to perform beautifully. There is good tech in game engines, but a lot of it comes down to an incredible amount of manual labor because you can target the internals of the engine. The web has to handle any random content thrown at it.