To be fair, the Mali is considerable weaker than the Adreno chip, but it’s still quite good. For 3D games on the phone, I’d suggest you use Game Tuner anyway, to reduce the resolution to 1080p, or even 720p. Saves battery, and doubles or even triples the 3D performance. I’d say the Adreno is even too powerful, and you don’t really need it.
Plus, it’s not fully compatible with GLTools. For example, you can’t do this with a Snapdragon, only with Exynos/Mali: https://youtu.be/-3YGKDlSG2U