Android is maturing. Big changes are becoming increasingly rare, therefore, I think Android and perhaps also hardware vendors should move to a two-year release schedule. I think it's time to accept that annual releases are no longer necessary.
Now that we fully understand the use cases of the smartphone, I believe Android should provide an advanced mode or power user mode that extends beyond Developer Options for developers. I'd like to hand an Android phone to my grandmother in Basic Mode and know she can't possibly mess up, but also I want to be more enabled in a Power Mode where not screwing up my device is my responsibility. I think the casual and advanced user are different beasts and should be respected separately.
Finally, I want to see mainline support for desktop mode. Android can increase demand for high-end devices and rejuvenate the premium segment if it shows that it fits new use cases to justify the money. Many users no longer own a laptop computer. Android should move now to capture this form factor.
Written from my Google Pixel 8 Pro.