JarateKingFor league admins:
I don't believe this offers any actual, cheaty advantages -- it cleans things up and hypothetically leads to slight fps improvements (I haven't benchmarked but the common wisdom is smaller textures and mipmaps = better memory locality within GPUs = less cache misses = better performance GPU-side) without doing anything that offers material gameplay benefits. And likewise I doubt valve really cares either, since these flat textures rely on the same fundamental techniques as the old clean tf2 flat textures did (as well as at least one earlier flat textures mod), so we're talking about public methods that have been around for over half a decade now. But it's just the nature of CleanTF2+ that a lot of it runs in a gray area of what is acceptable and what is an exploit.
A lot of my stuff in the past has caused issues for leagues, and I've put in effort to make sure CleanTF2+ doesn't violate league rules, but I also know that I'm not very active anymore (outside of the huds.tf and mastercomfig discords, which would be the best bet to contact me) so if I'm not kept in the loop then CleanTF2+ might not be updated for some time (the metal footsteps being one example). I'm glad to help so if there are any league concerns about these, feel free to contact me through discord as that'll be the easiest.
why are metal footsteps still included in this? players caught using them receive a 1 year ban