Game passes exist for PC as well, and offer even more variety there.
Boot time should never take 30sec on PC as well. But most consoles are actually not much faster in boot and loading times. People tend to compare a PC booting from cold with a console just booting from sleep/hibernation mode.
Boot times on PC however can easily be further optimized, especially when not using Windows for gaming. A gaming Linux distro will be faster by leagues, even in a cold start.
The device needing more power won’t get it, simple. Depending on what device it is, it will automatically throttle down so it needs less power, but obviously it will also deliver less performance while so throttled. And if the power is missing during a very sensitive part of a process so there’s no time to throttle down, your PC could blue screen or restart.
It’s very unlikely to suffer any long-term damage from this.