this post was submitted on 14 Sep 2023
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Because changing the engine in an existing project is a huge pita that requires many, many hours and possibly in some cases a full rewrite.
This also applies to games that would be released in 2023 or 2024.
Nobody should be considering Unity for a new project, but it's understandable to make either decision for many existing projects.
Ripping out the engine of your game isn't a trivial thing.
Many many hours is a massive understatement.
Thousands and thousands of hours is more appropriate
I don't know how you could change the engine without rewriting the entire thing basically from scratch.
It really depends on how modular their codebase is. The Doom 1/2 modern ports they did in 2019 use Unity. But it's actually still the original Doom underneath and just using Unity for input and output to make porting easier