What is the real use of system restore point in windows installer?

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To optimize the MSI installation, I have disabled the system restore point (MSIFASTINSTALL=3) in my installer. Now installation time is reduced as I expected. But I want to know whether it is a good practice or not? Is there any drawback of disabling the system restore? What is the actual use of disabling the system restore point in windows installer? I can see a lot of articles about this. But I can't understand them clearly. It would be better if anyone explains these things in simple words.

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