Correct but GOS reverses alot of Google patches like always on voice requires kernel privalage it is disabled on GOS etc. But kernel level signature spoofing gives way for a malicious app to spoof as micro g and infect your device and you would never know because micro g requires the same thing to function it is making itself look like Google when it is not google. So using microg opens your device up to allot more ways for it to be compromised and also makes it harder to detect or notice once it is compromised. For me the security risk of kernel level spoofing is way to high to use on a production device used everyday. Also I trust neither Google or microg I only use Foss apps I don't have Sandboxed play services installed at all I just don't use Google anymore.