Allow something other than 50/50 split between top and bottom. Improve font contrast. The hidden app section at the top should be made optional.
We’re going to consider this implemented in V9.0 42.2 and later. You can change the size of apps, and the top app selection bar has been redesigned (and gone from the top). No nav button is needed, and a new Music button always has direct access. Less used apps are still two taps.