Apple has always very tightly controlled what components go on their mobo's, and wrote their OS and application stack with that specific hardware in mind.

I've had a 2017 MBP: it goes to sleep, continues to check email etc, and wakes up the next day with an almost full battery. I don't have any M1 Macbooks but I can imagine they could stay awake and have 90% battery left the next day.

Macs also continue responding to pings and accepting SSH connections on wired Ethernet while sleeping. I've had less luck with inbound SSH over Tailscale, but I can use any other device on the network as a jumphost.