Don't buy the M-series Mac for gaming....especially Steam gaming. AFAIK, all Steam games & even the Steam client are Intel apps. Apple has already announced they will be retiring Rosetta 2 in a few years, so even if a game works today, it will likely cease to work in a few years. Plus many games for the Intel Macs do not run very well on an M-series Macs.
I just looked an Valve has finally released a Beta test version of the Steam client app for an M-series Mac (native app so Rosetta 2 is not needed to run the Steam client beta version). Unfortunately this is only the Steam app, not any of the Steam games. I would not expect any existing Steam games to natively support an M-series Mac even in the future....after all it took five years to have an M-series native beta version of the Steam client.
https://www.tomsguide.com/computing/macos/steam-runs-natively-on-mac-with-apple-silicon-how-to-try-it
https://9to5mac.com/2025/06/12/steam-finally-goes-native-on-apple-silicon-heres-how-to-try-it/
Even if a Steam game "runs" on an M-series Mac with Rosetta 2, many times the performance of the game will not be great. I've seen reports of people using the paid third party app CrossOverMac to play games for an Intel Mac and the results were mixed depending on the game since a special graphical library was needed & this special graphical library does not allow for great performance. After all there are multiple layers of translation going on here for the CPU & GPU.
One thing I've learned over the years when it comes to game developers & publishers......they rarely update the game to work on newer systems even when the CPU architecture does not change. I would expect even fewer existing games for the Intel Macs to be ported to the M-series Mac.
When Steam releases M-series Mac compatible games, then things will be different.
If you purchase an M-series Mac for other things and it happens to work with a particular game, then great! But don't buy the M-series Mac expecting a good gaming experience or you will be disappointed.
Macs have never been a gaming system. Macs have always been a sub par gaming experience especially for online games. There may be a few exceptions of course, but that is the general experience.