1) It needs an option to be the exact height of the menu bar when collapsed. On my system, it's ~4 pts taller then the menu bar, which means it intrudes into the chrome of maximized windows. Ewww. The goal is to reclaim wasted space, not take more!
2) It pretty consistently drops frames when expanding on a system under light memory pressure. Seems like there's likely a few pages that need to be wired to keep it from needing to page in too much on activation? Tracing memory accesses on activation, clustering those functions (with order files) and variables (with linker scripts) to a minimal number of pages, and wiring those pages could make this better. Dropping frames is a bug!
2.5) I don't use my laptop for music. Let me turn off the red "note" that launches Music, because (a) it's useless and (b) it's really buggy for those of us who have never accepted Apple Music terms of service -- full UI lock-up when waiting for permission. Instead, let me put something useful there. A CPU meter would be amazing! Or even better, an indication of whether a terminal is still executing a command / done and ready for input -- not sure how to hook this in general, but would be great.