These models serve a purely functional purpose rather than an aesthetic one:
Counter-Strike was first released in 1999 as a mod for Half-Life. The game quickly gained popularity, and Valve Corporation, the developer of Half-Life, eventually acquired the rights to the mod and released Counter-Strike as a standalone game. The initial version of the game featured simple, low-poly player models, which would later become a hallmark of the series. cs 16 player models red and blue
CS 1.6 (released September 12, 2003) was the first version integrated into Steam . However, a strange cultural split happened: The Definitive Guide to CS 1
Seeing Red (and Blue): Why CS 1.6 Pros Loved High-Visibility Models and Valve Corporation