Your computer is designed to be used. Still, the more you use it the sooner it will fail. THe drive wears out. The batteries have limited recharge capacity. On the other hand if you put it on a shelf and never turn it on it will also eventually fail as parts like batteries simply degrade with time.

Now how you decide to use it is up to you. Yes, if the CPUs are cranked up a lot it will generate heat. It will probably be reading the drive a lot. It might slow down other use if you are trying to play the game and watch a HD video at the same time.
Will Games Slow Down My Mac
Dec 13, 2012 8:07 AM
Will Gaming Slow Down My Mac Version
Jun 11, 2014 Here are our top tips for tuning up your machine when your Mac runs slow. When your Mac runs slow, give it a tuneup. By Adam Rosen. Restart the computer and hold down the Shift key until. Mar 17, 2020 Q: ” Why is my Mac running so slow? I have a MacBook Pro (2019) model. It’s old but hardly used, and is slowing down. I am wondering why my Mac is running slow and how can make it run like new?” — A User from Yahoo Answers Macs like all computers, Windows or Vista, can run slower over time.