I agree, through necessity I have tried many many different shoes. Fundamentally foam based cushioning does not retain its ‘bounce / cushion’ for very long.
Trapped air bags and gel technologies are better over the life of the shoe.
As an aside the Nike Cage 4 has great cushioning under the forefoot but the Nike GP Turbo with full length Zoom AND Air cushioning (for me) a) has the most cushioning and b) the cushioning lasts the life of the shoe.
However the very best cushioning can be found in basketball shoes as basketball players are kg for kg heavier and require more cushioning with identical requirements for support as tennis.
The downside is that many basketball shoes have a more garish design and do not have specific tennis functionality e.g., generous amounts of protection for sliding / toe dragging or extra durable outsoles (although if you customise your Nike basketball shoes you can specify the grey durable XDR outdoor court sole).
I have used the Nike KD12 in the past and that has had the very best cushioning of all, however the outsole lasts about 3 matches on an acrylic or asphalt tennis court!
For reference I am a heavier but dynamic player so am applying lots of force into my shoes when I play (none of this translates into great shots though!)
Oh, and another thing, I also use Sorbothane Double Impact insoles which are amazing.
I don’t work for Nike btw.