I agree 100% and also have an OWC dock that should be compatible with sleeping. It works great with my other machines. Like you said as well, these M-series Macs seem to have major issues with just about all external devices.macOS still has a major issue with third party Thunderbolt and USB-C docks so I regularly power off or restart my system every single day. This is why I need to use a Mac Studio or just about to be pushed to a Mac Pro for IO. I wish Apple had their own dock that works better, I have tried dozens, even the $400 ones from OWC and they all have issues once my system goes to sleep. The power button location is quite horrible due to this.
Or did I read that wrong and you're saying that the Studio does work with things correctly? Or were you just saying that it has extra ports, so less dock usage? If the Studio works well and is a fix, then clearly something is wrong on the Mini lineup.