Which is an excellent argument for why the WT team should have done some benchmarking, identified that they have a really dumb O(M*N) bottleneck in a critical p

Which is an excellent argument for why the WT team should have done some benchmarking, identified that they have a really dumb O(M*N) bottleneck in a critical part of their application (their rendering code), and optimized it. It is not an excellent argument for why 'clean code' is not a better fit for the other 99% of their codebase.