As @lizardmenfromspace points out, it is very possible to change the default, but I side with @froggy_legs.
CMD+[ and CMD+] are extremely common for navigating back/forward in many, many macOS apps, they should be the defaults on Obsidian.
Moreover, the current hotkeys CMD+-> and CMD+<- conflict with standard text cursor navigation (to start/end of line) on macOS. Arguably, from a UX perspective, that is even more critical.