Adidas ultra boost 21 - alert

With shoes like the Saucony Endorphin Speed, Skechers GoRun Max Road 4+ Hyper, and Nike ZoomX Invincible Run all proving it's possible to have highly cushioned, highly responsive shoes without adding any weight, it makes me wonder how the Ultra Boost 21 is relevant today.

The upper of the Ultraboost reminds me of the first version of the React Infinity Run Flyknit: both have loose heels resulting in subpar foot lockdown.