The kernel default has been changed so that machines (with lids) will suspend automatically if the lid is closed.
The installer no longer asks the question (which in 5.6 defaulted to yes). This choice will allow suspend/resume to be tested & improved even further. It is already prompting some developers to look into more sophisticated heuristics, and we'll see where that goes. Anyone who wants it off, echo machdep.lidsuspend=0 >> /etc/sysctl.conf or sysctl machdep.lidsuspend=0