Well, sRGB is sort of perceptually linear. Its roots trace back to a 50s technology compromise between perceptual linearity, color gamut, & encoding cost for CRTs that held up with only minor tweaks until CRTs stopped being widely used.

Maybe a fancier model like oklab would outperform it for this specific case, but only in quality, not performance oklab is more expensive to convert to/from compared to sRGB, which is usually free as your backbuffer and textures are usually sRGB.