Clever marketing, nice stickers and bragging rights 😆
My understanding is the PUSH parts are mostly about increasing oil flow and hence allowing the shock to recover from multiple hits.
Big hits are easy to handle but multiples tend to pack the shocks down and prevent them recovering – especially if they have the Fox patented pro pedal pish installed (a big washer in the piston instead of proper shims).
If your paying for a custom tune with TFT it’s not much more to get a few shiney bits inside and a nice sticker – that was why I went for Push last time.
Probably could have got the same performance with only a custom tune but the sales patter was good… and I’ve been very very happy with the results.