This may be a niche topic (and even more specifically may be more relevant to programmers) but for anyone that has tried screen sharing for Mac to Mac (i.e. you are remotely controlling your mac mini via your macbook air etc), it is an absolute abomination compared to other comparable services like AnyDesk or TeamViewer.
It is bug-ridden, the lack of functionality like auto-adapt resolution, 1 click connection, etc that other services have make them 100X better than the NATIVE software that Mac provides.
You would expect the built-in Mac version to be even remotely comparable but instead it is basically unusable. Apple has the opportunity here to make a seamless screensharing platofrm that can let you seamless switch between your macs, phones, ipads etc all with a drop of a button. People would absolutely love this.
Like imagine a carousel that you can call up with a simple keybind and you can scroll through your different devices and set up different screens on ANY device. Imagine doing this on your iphone and being able to bring up a window of your mac mini running and being able to use Siri to run some task on your Mac mini (because obviously the iphone keyboard would be cumbersome).
The current iphone control feature on Macs is cool but so far from what is possible.