[WorldMaker]

Most .NET projects that Linq originally targeted ran in so called "Server" and/or "Workstation" GCs (.NET has had very generic public names for its GCs for a long time which were also somewhat misnomers because even some Desktop apps would run in "Server" GC and it was possible for vice versa [0]) where allocations were cheap, garbage collection was relatively cheap (because both GCs were multi-generational, had strong [but different] tuning for their generations, etc).

Unity inherited a much simpler Boehm GC from Mono. Under a (single generation) Boehm GC allocations are a bit more expensive and garbage collection sometimes a lot more expensive. (A Boehm GC was much easier for C++ engine code to understand/interact with, which is also part of why the .NET modernization project for Unity got so complicated and still has such a ways to go left.)

[0] Fun aside: in fact, modern docker advice for .NET is to switch "server applications" to use "Workstation GC" if you need to stack multiple containers on the same host because of differences in expected memory usage.