Thanks for sharing! I really enjoy reading these types of articles.
I was a bit surprised to see Perforce being used (I'm not a game developer), I have not come across it since the early 2000s. From what I recall it was very good dealing with merges.
Perforce and Plastic (now Unity, ugh) are used widely. They are AFAIK the only VCS that can handle large binaries, huge repos (XX TBs) and out of the box diffing on non-text files. Plus a nice client for non-technical folks (artists) to use.
Perforce is the standard for the last 15 years at least in video games. Probably more, that's just based on my experience. Any game middleware has to support it, Unreal Engine even if public on GutHub uses Perforce for their development internally, the GitHub is a two-way mirror.
I was a bit surprised to see Perforce being used (I'm not a game developer), I have not come across it since the early 2000s. From what I recall it was very good dealing with merges.