Windows Vista introduced this same concept. Performance was awful unless you had compatible graphics acceleration. 20 years later, I think most devices should be fine, especially Apple devices.
Unlike previous GDI acceleration, DWM.EXE could composite alpha channel quickly with the GPU, and generally achieved much higher fill rates on the same hw - if the drivers worked properly.
Even on modern devices though which have more computation and graphics power to the point that they aren't going to actually lag or anything while rendering it, why waste cycles and battery animating these useless and distracting things? There's no good justification.