A number of smaller ones do as well. Honestly, to survive, no company can afford not having "R&D" style operations in some fashion! Size has absolutely nothing to do with it.
However, I think you misunderstand. The reinvention work Jason Gregory describes wasn't in R&D. It was in the run-of-the-mill software development department.
Writing your own implementation of something is as common and valid in professional development as using someone else's. It just has to be taken case-by-case.
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It all depends on the employers, a big company like EA can afford R&D for sure!
A number of smaller ones do as well. Honestly, to survive, no company can afford not having "R&D" style operations in some fashion! Size has absolutely nothing to do with it.
However, I think you misunderstand. The reinvention work Jason Gregory describes wasn't in R&D. It was in the run-of-the-mill software development department.
Writing your own implementation of something is as common and valid in professional development as using someone else's. It just has to be taken case-by-case.