I like colour, but can easily empathise and visualize that I may like colour in applications I've configured, but found it obtrusive in something that vomits inconsistent, garish, distracting coloured output. So while I would not necessarily use this environment wetting, I can understand why some would treasure predictability and consistency.

Note btw that one might have a wildly different perspective as e.G. Developer using a few tools on their own controlled desktop a lot, vs e.G. a sysadmin constantly jumping between large number of tools on large number of systems. As such, having a simple variable to shut up all the apps on all the servers may be quite handy.