Will a M1 Macbook Matte Case damage the hydraulics?

Any covering that alters air flow through the case interior or over and around the case exterior can cause overheating. Whether or not it does is always dependent on the individual machine, ambient temps, usage patterns and etc. If it does take it off, but then you've spent money for nothing.

Seems to me a more practical solution is a sleeve of some sort to protect your MacBook when not in use and being transported.

highdra Said:

"Macbook Case: I have a M1 Macbook Matte Case on, because I want to protect it from minor and major scratches/bumps. I have heard that it will damage the hydraulics. Is this true? Does it do more good than harm?"

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Based on Personal Experience:

Using a hard case would be unwise. It is not a good idea to use, as it caused my Mac to overheat consistently, eventually leading to failure.

Use of a Sleeve:

So, what I use is a sleeve, and then I take it out of it, when I need to use my Mac. Once done using my Mac, I let it cool for a bit, and then close the screen, placing it back in the sleeve.  What I use: MOSISO Laptop Sleeve - Amazon

Hi,

Not sure about M1 MacBook Air, though I've been using hard case as well as keyboard protect cover for MacBook Air without any problem.

Try to check temperatures of inside parts with checking temperature monitor like following if the temperature is high.

https://www.bestmaccleaner.com/mac-temperature-monitor/